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Results for GMT & World Time

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GMT & World Time

The traveller complications: Rolex's 1954 GMT hand and Louis Cottier's 1937 World Time mechanism.

Insight: Hairspring Materials and Evolution Part I SJX Watches
Casio n Jul 11, 2025

Insight: Hairspring Materials and Evolution Part I

The invention of the hairspring was among the greatest breakthroughs in horology, since its inception suddenly made mechanical timepieces portable, transforming clocks into watches. This not only marked the start of precision timekeeping, but also set mankind upon the long road to perfecting the accuracy of mechanical watches, arguably the most sophisticated pieces of kit on Earth at the time, when such precision was paramount for fields as varied as navigation, warfare, and astronomy. The hairspring turned 350 years old in 2025 and we’re marking the occasion with a series of stories on the topic, including the story of the spiral hairspring and also the importance and evolution of the overcoil. Now we turn to temperature compensation and metallurgy in a two-part story covering the evolution of the hairspring materials up until metal alloys. More exotic materials and inventions will follow in Part II. Elasticity and thermal expandability  One of the fundamental factors in hairspring function is ambient temperature, simply because metal alloys expand or contract uni-directionally with a change in temperature. As a result, watchmakers used calorimetry, the science of temperature effects, and material science, specifically metal alloys, to their gain in advancing hairspring technology. The equation below shows the relation between the initial length of a metal strip L0, measured at a given temperature and the final length LT after a certain change in temperature.  The equ...

Hamilton Khaki Field Mechanical Review Teddy Baldassarre
Hamilton Khaki Field Mechanical Review Jul 10, 2025

Hamilton Khaki Field Mechanical Review

Is there a contemporary field watch as beloved and versatile as the Hamilton Khaki Field Mechanical? At this point the illustrious military history of the Khaki Field watch has been thoroughly explored (and if you’re not familiar with it, our resident historian Mark Bernardo has written an encyclopedic guide here). In short, Hamilton produced over a million watches for the United States military during World War II with its field watch in specific garnering praise for its universally consistent quality. This predecessor to the Khaki Field was a 34mm-wide field watch done in a chrome-plated metal case with radium lume dials and a manual-wind Caliber 987 movement. The modern Hamilton Watch Company was bought by the Swatch Group in 1974 with much of the production already having moved to Switzerland in 1969. The brand’s reassertion as a bonafide, authentic maker of military tool watches with historical provenance proliferated as an entire collection under the “Khaki” umbrella. While it was still producing watches for actual military units in the 1980s and ‘90s, Hamilton had done well by marketing to civilians once again in the wake of the Vietnam War. These early post-war civilian Hamilton Khaki watches were co-branded with retailers like Brookstone, Orvis, and L.L. Bean. This was also the time during which the “Khaki” logo began popping up on their dials. In 2018, Hamilton released the Khaki Field Mechanical which has gone on to be one of the most popular and b...

Fratello Summer Watch Picks 2025: Daan’s Choices From Longines, Girard-Perregaux, And Ressence Fratello
Girard-Perregaux Jul 10, 2025

Fratello Summer Watch Picks 2025: Daan’s Choices From Longines, Girard-Perregaux, And Ressence

The Sun is shining, temperatures are rising, and my kids are finishing their classes. At last, our summer vacation is just around the corner. It’s time to go through the watch box and pick my watches for a road trip through France and Spain. I’ll probably end up with the Rolex Explorer 114270 as my […] Visit Fratello Summer Watch Picks 2025: Daan’s Choices From Longines, Girard-Perregaux, And Ressence to read the full article.

Introducing: The CIGA Design × Label Noir Black Star Fratello
Jul 9, 2025

Introducing: The CIGA Design × Label Noir Black Star

CIGA Design continues to develop its GPHG-award-winning formula, first showcased on the Blue Planet. A customized movement utilizing an in-house complication displays the time in a manner distinct from a typical watch. The perfectly round, interstellar-like case often houses a dial featuring our planet. Today, that changes with the new CIGA Design × Label Noir […] Visit Introducing: The CIGA Design × Label Noir Black Star to read the full article.

Patek Philippe & Tiffany: The History Behind The Hype Teddy Baldassarre
Patek Philippe & Tiffany Jul 9, 2025

Patek Philippe & Tiffany: The History Behind The Hype

As longtime, mutually beneficial relationships in the world of high luxury go, the one between Patek Philippe and Tiffany & Co. is perhaps the most quintessential. The esteemed Swiss watchmaker behind classic timepieces like the Calatrava and Nautilus and the elite retailer/jeweler renowned for its distinctive blue gift boxes have been partners for more than 170 years, and Patek Philippe watches with a Tiffany signature are among the rarest and most coveted items on a serious watch collector’s wishlist. In this feature, I explore the long and prestigious history behind Patek Philippe’s Tiffany watches and spotlight how the two world-famous brands continue to collaborate today.  Patek Philippe: The Origin Story The company that would be known as Patek Philippe had its foundation laid in 1839, when a Polish watchmaker named Antoni Norbert de Patek and his business partner, Czech-born François Czapek, partnered to form Patek, Czapek, & Cie, in Geneva. The company produced pocket watches for a relatively brief period before disagreements between the two founders precipitated the dissolving of the partnership, and the firm, by 1845. That same year, Patek began a new partnership with a French watchmaker named Adrien Philippe, whose historical claim to fame was the invention of the keyless winding system for watches. Together, they established a new company, Patek & Cie., to continue making watches, which officially became Patek, Philippe, & Cie. in 1851. That year was pivo...

W Worn & Wound
Worn & Wound
Brew Metric Lite Jul 9, 2025

Lookbook: Brew Metric Lite is Finessed Form, Function, and Fun… All In One

In the world of watches, simplicity is frequently overlooked. But the new Brew Metric Lite is proof that petite doesn’t have to mean pared-down. With clean lines, charming proportions, and an unapologetically unisex design, it hits that rare balance of effortless style and everyday wearability. It’s not a trophy watch, it’s a companion-to coffee dates, late nights, and everything in between. The Metric Lite reimagines Brew’s signature style as something more universal-stripped back, but still unmistakably “Brew.” It’s an automatic three-hander with no gimmicks, just good design. The case is compact but confident, sliding under cuffs or over bare wrists with equal ease. And with a softened rectangular silhouette and muted dial tones, it’s simple yet stylish, fun yet formal, small yet substantial, refined yet relaxed. The post Lookbook: Brew Metric Lite is Finessed Form, Function, and Fun… All In One appeared first on Worn & Wound.

The Windup Watch Fair 10-Year Celebration Rolls Into Chicago - Here’s What to See and Do This Weekend Worn & Wound
Tudor DOXA Celeste Jul 8, 2025

The Windup Watch Fair 10-Year Celebration Rolls Into Chicago - Here’s What to See and Do This Weekend

The Windup Watch Fair is heading back to the Windy City for what promises to be our biggest and boldest Chicago event yet-and this time, we’re celebrating a major milestone: 10 years of Windup. From July 11–13, Windup returns to Venue West for three full days of hands-on watch experiences, exclusive launches, engaging panels, and some unexpected surprises. This year’s show features over 40 exhibiting brands, including exciting first-time participants like Tudor, DOXA, Celeste, and Watch Craft. There will also be raffles, giveaways, a Scotch tasting bar, and much more. The event is completely free and open to the public, so whether you’re a seasoned collector, a curious newcomer, or somewhere in between, there’s a place for you at Windup. Windup Watch Fair Chicago Friday, July 11 – Sunday, July 13, 2024 Venue West 221 N Paulina St Chicago, IL 60612 Free and open to the public. Thanks to Our Lead Sponsors We’re thrilled to welcome back our Lead Sponsors, each bringing something exciting to the table-some quite literally. Atelier Wen returns with the Perception, a stunning example of East-meets-West horology. The watch’s intricate guilloché dial, crafted by hand in China, is a modern feat of mechanical art. Casio is showing off their G-SHOCK MTGB4000, a robust, high-tech statement piece loaded with both analog soul and digital brains. Even more exciting? We have it on good authority that Casio will be launching something completely new on day one of the ...

First Look - The New Schwarz Etienne 1902 Réserve de Marche, a Contemporary Classic Rooted in Tradition Monochrome
Schwarz Etienne 1902 Réserve de Marche Jul 8, 2025

First Look - The New Schwarz Etienne 1902 Réserve de Marche, a Contemporary Classic Rooted in Tradition

The romantically inclined would agree that there is a certain intimacy in winding a watch by hand, a moment of pause, intention, and awareness of time’s passage. With its latest creation, the 1902 Réserve de Marche, Schwarz Etienne invites that quiet ritual back into the rhythm of daily life, full of automatically performed actions. Building […]

SJX Podcast: Urban Jürgensen’s Revival, Breguet’s Birthday, and Spring Auctions SJX Watches
Breguet s Birthday Jul 8, 2025

SJX Podcast: Urban Jürgensen’s Revival, Breguet’s Birthday, and Spring Auctions

SJX and Brandon Moore kick off episode seven of the SJX Podcast with the relaunch of Urban Jürgensen (which includes a tribute to Derek Pratt’s Oval pocket watch), discussing why this time might be different. Also on the docket is a recap of the spring auction season, which included strong prices for hot names in independent watchmaking, though other “indies” waned, surprising showings from hitherto esoteric clocks and pocket watches, and some value buys with out-of-vogue timepieces. Lastly, we recap Breguet’s 250th anniversary launches so far, which have met with a mixed reception, but demonstrate signs of life for a historic brand. Listen on Apple Podcasts, Spotify, and YouTube.  

First Look - The New Bulgari Octo Finissimo Tourbillon with a Green Marble Dial Monochrome
Bulgari Octo Finissimo Tourbillon Jul 7, 2025

First Look - The New Bulgari Octo Finissimo Tourbillon with a Green Marble Dial

Incredibly, only eleven years have elapsed since Bulgari pitted its first gladiator in the arena of ultra-thin watches. Not only did the Octo Finissimo Tourbillon of 2014 astonish the world with its razor-thin, record-breaking 1.95mm tourbillon movement, but it also conquered the hearts of many with its seductive Italian good looks. With ten world records […]

A Hands-On Introduction To The Colorful Batavi Marina Chronograaf Collection Fratello
Jul 7, 2025

A Hands-On Introduction To The Colorful Batavi Marina Chronograaf Collection

It’s summer in the Northern Hemisphere, so it’s time to dust off your colorful watches. If you haven’t got any colorful options in your watch box yet, look at the new Marina Chronograaf collection by Batavi. As always, the Dutch brand offers surprising color combinations, and the modest pricing turns these models into perfect “bonus” […] Visit A Hands-On Introduction To The Colorful Batavi Marina Chronograaf Collection to read the full article.

Sunday Morning Showdown: Chopard L.U.C Quattro Mark IV Vs. Patek Philippe Calatrava 6196P Fratello
Patek Philippe Calatrava 6196P It’s Sunday Jul 6, 2025

Sunday Morning Showdown: Chopard L.U.C Quattro Mark IV Vs. Patek Philippe Calatrava 6196P

It’s Sunday morning, so it’s time for a cup of coffee and a new installment of our Sunday Morning Showdown series. We’ve selected two platinum dress watches introduced during Watches and Wonders 2025 for this week’s battle. Mike’s pick is the brilliant Patek Philippe Calatrava 6196P. The widely praised return of the classic Calatrava was […] Visit Sunday Morning Showdown: Chopard L.U.C Quattro Mark IV Vs. Patek Philippe Calatrava 6196P to read the full article.

eBay Finds: A Fun Digital Seiko from the Year Star Wars Premiered, a Hamilton with a Unique History, and a Zodiac Sea Wolf in Great Condition Worn & Wound
Hamilton Jul 4, 2025

eBay Finds: A Fun Digital Seiko from the Year Star Wars Premiered, a Hamilton with a Unique History, and a Zodiac Sea Wolf in Great Condition

eBay Finds is back! This bi-monthly installment will feature a selection of watches currently listed on eBay that have caught the eye of editor Christoph McNeil (@vintagediver). If you come across any hidden gems on the ‘Bay drop us a note at info@wornandwound.com for potential inclusion. Vintage Zodiac Sea Wolf  The Zodiac Sea Wolf is an absolute icon in the vintage dive watch world, and this early metal bezel version is a nice example. There were many iterations of the Sea Wolf, with various bezel materials, dial colors and date/no date versions. This black dial, date with metal bezel is an earlier combination, and definitely sought after. The plated bezel is usually pretty worn, and the lume can be degraded or re-done on these. This example has a nice clean black dial with great lume on the dial and hands, and the bezel is in top shape. The crown is also original and signed with the Zodiac logo as it should. No movement pictures but the seller states the watch runs well.  View auction here Vintage 1970s Bulova Jet Star  Here’s a wild vintage Bulova from 1974, that looks every bit the 70s watch. The 40mm gold plated UFO style case is excellent and unpolished, still showing the original radial brushed finish. The case may draw your eye, but it’s the bold two-tone orange dial that keeps you looking! The dial is a bright orange that turns darker at the outer edge. Applied markers outlined in brighter orange and steel and white hands with a day-date window at 3 o’...