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Results for Marine Chronometer & The Longitude Problem

44,057 articles · 255 videos found · page 34 of 1478

The Rivanera Gets Echo/Neutralized By Seconde/Seconde/ Fratello
May 1, 2026

The Rivanera Gets Echo/Neutralized By Seconde/Seconde/

It’s always fun to see a seconde/seconde/ take on a popular watch. With the many whimsical releases Romaric André created while collaborating with brands, you sometimes wonder whether he is ever short of good ideas. So far, though, that hasn’t been a problem. If anything, I have seen the releases become better over time. The […] Visit The Rivanera Gets Echo/Neutralized By Seconde/Seconde/ to read the full article.

First Look - The New Zenith G.F.J. in Tantalum and Yellow Gold, Continuing the Legacy of the Calibre 135 Monochrome
Zenith G.F.J Apr 15, 2026

First Look - The New Zenith G.F.J. in Tantalum and Yellow Gold, Continuing the Legacy of the Calibre 135

When Zenith brought back the legendary Calibre 135 last year in the G.F.J. collection, it was a tribute to its 160-year history. Also, it signalled the return of one of the most celebrated chronometer movements. Now, the brand expands the collection with two new G.F.J interpretations: a tantalum edition with an onyx dial and diamonds, […]

Fratello Talks: How Much Does Chronometer Certification Matter? Fratello
Apr 9, 2026

Fratello Talks: How Much Does Chronometer Certification Matter?

“Chronometer” is one term that frequently comes up in watchmaking. We see it stamped on dials, highlighted in marketing materials, and often used as a synonym for “high quality.” But how much does chronometer certification actually matter to us as collectors? In this episode of Fratello Talks, Nacho is joined by Daan and RJ to […] Visit Fratello Talks: How Much Does Chronometer Certification Matter? to read the full article.

In-Depth: Understanding Resonance in Watches SJX Watches
F.P. Journe s Chronomètre à Résonance Feb 19, 2026

In-Depth: Understanding Resonance in Watches

Resonance watches are among the most elusive machines in modern watchmaking. Creations such as F.P. Journe’s Chronomètre à Résonance perform well at auctions, commanding high prices. While their rarity and appeal are undeniable, watches that purport to harness resonance tend to be viewed with a degree of skepticism. A measure of skepticism is understandable - the concept of sprung balances becoming almost magically coupled is anything but straightforward and requires a profound understanding of oscillators in general.   This story seeks to shed some light on the concept of coupled oscillators by explaining the two models of coupling and explore the nuances of each system. Before exploring resonance, the reader is encouraged to review the basics of sprung oscillators and isochronism in order to become more familiar with the hairspring and balance wheel model.  The F.P. Journe Chronomètre à Résonance Souscription No. 2 sold for more than CHF3 million in November 2025. A confusion of terms First, the term resonance itself requires definition. In classical physics (mechanics, electrical engineering, signal processing, etc.) resonance is a phenomenon where a system vibrates under the influence of an external driving force that matches the system’s eigenfrequency (natural frequency). This is to say that a system at rest, which includes mass and spring elements, can be excited into a state of resonance by an external force when particular conditions are met. An imp...

A Closer Look At COSC’s New Excellence Chronometer Certification Fratello
Feb 17, 2026

A Closer Look At COSC’s New Excellence Chronometer Certification

Contrôle Officiel Suisse des Chronomètres (COSC) is the largest Swiss independent testing facility for watch movements. Founded in 1973, this non-profit foundation aims to guarantee the precision of Swiss watches through a neutral, independent, and rigorous method. Watches with movements that passed the tests can be called “COSC-certified chronometers,” accurate to within -4/+6 seconds per […] Visit A Closer Look At COSC’s New Excellence Chronometer Certification to read the full article.

Affordable Vintage: the Longines Grand Prize Worn & Wound
Longines Grand Prize Longines Feb 4, 2026

Affordable Vintage: the Longines Grand Prize

Longines is a storied and well-respected Swiss watch manufacture that formed in 1832 and has continued uninterrupted to this day. From the first wrist chronometer in 1911, to groundbreaking flyback chronographs in the 1930s, to the world’s first hi-beat wrist chronometer in 1959, Longines holds their own in the watchmaking world.  My favorite period for watches is the 1950s through the 1970s and Longines was one of the top accessible brands during that time. In 1954 Longines began a marketing strategy of product families, launching the Conquest line of watches. In 1957 they introduced the Flagship line, adding to what would become a large group of watch families, many of which are still made today. Other lines that came later include the Admiral, the Ultra-Chron and the Grand Prize. The Grand Prize line was named in honor of the multitude of watchmaking awards and honors that Longines had accumulated over the decades. It was a relatively short-lived family, produced from about 1958 to 1964 according to my research. I have found that the majority of Longines watches produced during these decades were all fairly equal in quality and craftsmanship, with most of the differences in the families being design related. The Conquests were rugged and sporty, on par with the early non-diver Omega Seamaster watches. The Flagship series were dress watches, while the Admiral line was a mixture of both. The Grand Prize family were pretty much all thin, elegant everyday type dressier w...

Hands-On With The Vostra Vector: A Retro-Futuristic Chronograph That’s Built To Be Worn Fratello
Ming Jan 18, 2026

Hands-On With The Vostra Vector: A Retro-Futuristic Chronograph That’s Built To Be Worn

There’s a certain kind of satisfaction that only a chronograph can offer - the tactile click of the pushers, the sweep of the seconds hand, the quiet excuse to time things that probably do not need timing at all. You know exactly what I mean; we all do it. The problem is that many chronographs […] Visit Hands-On With The Vostra Vector: A Retro-Futuristic Chronograph That’s Built To Be Worn to read the full article.

What is a Chronometer Watch? A Guide to Ultra-Precise Watches Teddy Baldassarre
Ulysse Nardin foun Nov 28, 2025

What is a Chronometer Watch? A Guide to Ultra-Precise Watches

When a watch touts on its dial that it is a "Chronometer" or an "Officially Certified Chronometer" or even a "Superlative Chronometer," what exactly does that mean? How does a chronometer watch differ from a watch that does not make that claim? For that matter, a newbie to the timepiece game might ask, what is the difference between a watch with "chronometer" on the dial and a watch with "chronograph" on the dial? In this comprehensive guide, we attempt to answer all of your burning questions about chronometer watches and what sets them apart. [toc-section heading="The Chronometer Throughout History"] Our original, classical definition of a chronometer can be traced back to the golden age of seafaring exploration in the 18th Century, when ships required the use of a highly accurate onboard clock that enabled their navigators to determine longitude in order to avoid the perils of running aground or veering hopelessly off course. The man credited with developing the first of these “marine chronometers” was legendary British watchmaker John Harrison; his invention facilitated the celestial navigation used at the time by navigators at sea to determine their ship’s position in coordination with a sextant. Marine chronometers, which were essentially highly accurate clocks mounted on gimbals inside wooden boxes, were among the first portable timepieces and were instrumental in the global seagoing trade that helped build our modern, interconnected world. Ulysse Nardin, foun...

First Look - The Green Bovet Récital 30 Worldtimer Seddiqi Limited Edition Monochrome
Bovet Nov 19, 2025

First Look - The Green Bovet Récital 30 Worldtimer Seddiqi Limited Edition

Bovet‘s Récital line has always been where Pascal Raffy lets invention roam free: oversized domes, theatrical displays and genuinely mindblowing complications. The Récital 30 continues that tradition while making a pragmatic, travel-ready turn. Launched as a scaled-down, wearable sibling to the Récital 28, the Récital 30 focuses on one problem and solves it elegantly with […]

Introducing - The Yema Navygraf Pearl CMM.20 Flaunts a Mother-of-Pearl Dial and Bezel Monochrome
Yema Navygraf Pearl CMM.20 Flaunts Oct 30, 2025

Introducing - The Yema Navygraf Pearl CMM.20 Flaunts a Mother-of-Pearl Dial and Bezel

French brand Yema got a foothold in the watch world with its rugged tool watches, exemplified by models like the mighty 300 water-resistant Superman skin diver of 1963. Proud of its French roots, Yema secured strategic alliances with the French Navy (Marine Nationale) to develop military tool watches. Based on its 1970s Navygraf dive watch, […]

Longines’ Ultra-Chron Classic is a Double-Certified, High-Beat Chronometer SJX Watches
Jaeger-LeCoultre Geophysic E168 or IWC Oct 13, 2025

Longines’ Ultra-Chron Classic is a Double-Certified, High-Beat Chronometer

Longines continues to mine its archive to good effect with the Ultra-Chron Classic, a faithful reissue of the brand’s pioneering high-frequency wristwatch first launched in 1967. The Ultra-Chron Classic is more than just a remake of a vintage watch. While it has a clean, period-correct vintage aesthetic, the mechanics are entirely modern, namely a high-beat, 5 Hz automatic movement that is both COSC chronometer and TIMELAB certified. Initial thoughts Longines does well at bringing back beloved designs from the past, but built to modern standards. The Ultra-Chron Classic is the latest in a long line of historical reissues that began nearly two decades ago with the bestselling Legend Diver. The Ultra-Chron Classic is impressively faithful to the original in style, but because of that, not especially exciting in terms of design, retaining the all-business look that was common among high-performance gentlemen’s wristwatches of the era; the same criticism could be leveled at the Jaeger-LeCoultre Geophysic E168 or IWC Ingenieur ref. 666. In other words, the dial, hands, and indices are mostly true to the source material, but this pared-back look may have a harder time standing out in today’s market than it once did. Dressy? Classic? Or plain? Looks aside, the Ultra-Chron Classic is modern Longines at its best: a solid build, a brand-exclusive movement, proper sizing, and sensible pricing. The movement in particular stands out for being notable high-spec with its 36,000 bea...

I Found My Ultimate Dive Watch: The Rolex Sea-Dweller 16600 Fratello
Rolex Sea-Dweller 16600 Rolex has Sep 14, 2025

I Found My Ultimate Dive Watch: The Rolex Sea-Dweller 16600

Rolex has always produced watches that I have gravitated towards. For a long time, though, I grappled with some of the modern baggage that the brand has taken on. Modern Rolex sports watches have a certain bling factor that turns me off. The problem is that vintage Rolex watches are either unobtainable or, if I […] Visit I Found My Ultimate Dive Watch: The Rolex Sea-Dweller 16600 to read the full article.

Introducing - A New Era for a Historic Name as L.Leroy Returns with the Osmior Bal du Temps Monochrome
Sep 2, 2025

Introducing - A New Era for a Historic Name as L.Leroy Returns with the Osmior Bal du Temps

Founded in Paris in 1785 by Charles Leroy, L.Leroy was once one of France’s illustrious watchmaking houses, known for its marine chronometers, high complications and commissions for European royalty. After years of dormancy, the brand, acquired in 2004 by Miguel Rodríguez of the Festina Group, is staging a comeback. Following its first step with a […]

First Look - The New Formex Essence Space Ghost 41mm Automatic COSC Monochrome
Formex Essence Space Ghost 41mm Aug 14, 2025

First Look - The New Formex Essence Space Ghost 41mm Automatic COSC

Formex’s Essence line, introduced in 2018, quickly earned respect as the brand’s versatile, go-anywhere sports watch, combining sharp case architecture, great engineering, and chronometer-certified accuracy. In 2020, the collection took on a cosmic turn with the debut of the Space Rock editions, featuring dials cut from the ancient Muonionalusta meteorite. Over time, these rare cosmic […]

Voutilainen Realises a Collector’s Dream, the 28 Kohan SJX Watches
Vacheron Constantin Jul 17, 2025

Voutilainen Realises a Collector’s Dream, the 28 Kohan

Voutilainen recently completed a custom commission with the 28 Kohan, a one-off example of its signature chronometer wristwatch that blends Finnish cultural symbols with Japanese decorative arts. Much of the decoration on the watch is maki-e, traditional Japanese lacquer, that is the work of artisan Tatsuo Kitamura, a frequent collaborator who was also responsible for past Voutilainen maki-e timepieces. Initial Thoughts Unique pieces and commissioned watches were historically the norm at the highest end of the watch market, which was then much smaller. Clients could be more demanding, and for the watchmaker, the risk of being unable to find a buyer was very real. Today off-the-rack watches dominate, largely for commercial and production reasons. Even brands with a long history of bespoke or custom watchmaking eschew custom dial colours. Some, however, keep the practice alive, like Vacheron Constantin with its Les Cabinotiers. Many independents also remain amenable to customisation, even established names that no longer need to, like Voutilainen, albeit with a long wait. Bespoke watches are inherently difficult to criticise – such watches are a success as long as the commissioner is satisfied, even if it’s the most hideous thing ever. Fortunately that isn’t the case here, the adjective that comes to mind is bedazzling. I suspect maximalist designs are often common on Voutilainen’s custom watches because collectors want to make the most of the opportunity. Some deta...

Tudor Pelagos FXD: The Complete Guide Teddy Baldassarre
Tudor Pelagos FXD Jul 1, 2025

Tudor Pelagos FXD: The Complete Guide

When Tudor released the Pelagos FXD in late 2021 an important element of the brand's heritage was brought to light with it. A rich history of working with the French Navy, or Marine Nationale, was now being tied to a modern creation from Tudor in a new partnership. While the history brings an unusual depth to this watch (no pun intended), it’s the manner in which the Tudor Pelagos FXD has been executed that has made it truly interesting to a modern audience. This wasn’t a throwback design commemorating the past. Rather, this was a function-forward, modern design, built to spec for a niche group of divers in the French Navy. The FXD is a natural evolution of the Pelagos ethos, and its slightly unconventional approach has cemented its place in the hearts of many enthusiasts.  Tudor took a slightly different route with the FXD when compared to the existing Pelagos references. The watch was designed with input from the Marine Nationale’s Commando Hubert unit in order to better suit its combat divers' needs for a specific maneuver they employed while traversing underwater. This maneuver would have them swimming segments in a set direction for a set period of time, before adjusting time and direction to tackle subsequent sections. To better assist in this exercise, the fully indexed bezel is bidirectional, and counts down rather than tracks elapsed time. This allows for fast, precise movement (this is a 120-click bezel), and no ambiguity when measuring a pre-set lengt...

Hands-On With The New Gold-Plated Forstner Bracelets Fratello
Jun 3, 2025

Hands-On With The New Gold-Plated Forstner Bracelets

As a die-hard collector of vintage watches, I’ve grown to appreciate the right accessories to pair with my treasured pieces. Straps are a great option, and we’ve devoted plenty of articles to reviewing them. However, an appropriate bracelet is the chef’s kiss. The problem is that authentic bracelets are difficult to find and are often […] Visit Hands-On With The New Gold-Plated Forstner Bracelets to read the full article.

Interview - Andreas Wyss, CEO of the COSC, on the Need to Adapt and a “Super-COSC” Certification to Come Monochrome
May 28, 2025

Interview - Andreas Wyss, CEO of the COSC, on the Need to Adapt and a “Super-COSC” Certification to Come

If you own mechanical Swiss watches, one of them potentially came to you with a COSC chronometer certificate. But not everyone knows exactly what this certificate means. The COSC is the Contrôle Officiel Suisse des Chronomètres or the Official Swiss Chronometer Testing Institute. COSC certifies Swiss-made movements or watches as chronometers (not to be confused […]

Introducing: The Salmon-Dial Brellum Duobox Triple Calendar Moonphase Fratello
Apr 17, 2025

Introducing: The Salmon-Dial Brellum Duobox Triple Calendar Moonphase

Brellum releases many small runs of watches during any given year, so I was surprised to find that it’s been nearly six months since our last review. Now we’re back with a look at the new Duobox Triple Calendar Moonphase LE Chronometer. Yes, that’s a mouthful, but the welcome news is that the watch now […] Visit Introducing: The Salmon-Dial Brellum Duobox Triple Calendar Moonphase to read the full article.