What it is
The 2824 launched in 1972 as ETA's replacement for the older 2452 family, designed to be tough, simple, and cheap to mass-produce. The 2824-2 revision arrived in 1982 with improved keyless work and an upgraded automatic winding bridge. The architecture has been essentially unchanged for 40+ years; an estimated 50+ million units have been produced over its lifetime, easily making it the most-produced Swiss automatic of all time. Where the 2892-A2 is the thin, refined option (3.6 mm), the 2824-2 is the thick, robust, cheap option (4.6 mm).
"2824 vs 2892": pick one
Both are 25.6 mm diameter, 4 Hz, 4-hour power reserve, day-window date. The differences are practical. Thickness: 2824-2 is 4.6 mm, 2892-A2 is 3.6 mm. Cost: 2824-2 lands at CHF 60-130 in volume; 2892-A2 lands at CHF 250-400. Robustness: 2824-2 has a heavier rotor, simpler keyless work, and is more forgiving of shock. Service: 2824-2 is what every entry-level watchmaker is trained on; service costs are 20-30% lower. Modularity: 2892-A2 is the chronograph-module base; 2824-2 is rarely used as a chrono base because of its thickness. Brands pick by price point: a CHF 500 Tissot uses 2824-2; a CHF 5,000 IWC uses 2892-A2.
Grading: Standard, Élaboré, Top, Chronometer
Like the 2892-A2, the 2824-2 is graded into four tiers. Standard: -12 to +30 sec/day raw, basic finishing, the cheapest. Élaboré: tighter regulation, slightly better finishing. Top: Glucydur balance, Anachron hairspring, blued screws, perlage, regulated to ~±5 sec/day. Chronometer: COSC-tested, individually regulated to -4/+6. A "chronometer" Tissot Le Locle or Hamilton Khaki Field Chronometer is using a Top-or-Chronometer grade 2824-2. Brand-modified versions: Tudor 2671 (pre-MT5612), Breitling Cal. 17 (its 2824 base), Hamilton H-10 (modified for 80-hour reserve), Powermatic 80 (Tissot/Mido modified for 80-hour reserve, lower frequency).
The 80-hour reserve story
In 2010, Hamilton (a Swatch Group brand) launched the H-10 movement: a 2824-2 with a redesigned mainspring barrel and a slower frequency (3 Hz instead of 4) that gave an 80-hour power reserve. Tissot followed with the Powermatic 80, Mido with the Caliber 80, Longines with various L888 derivatives. All are 2824-2 architecture with a slower escapement and a stretched mainspring. Trade-off: slightly less amplitude, slightly less precise long-term, but the 80-hour reserve is a real customer benefit. By 2026 most entry-tier Swatch Group automatics are 80-hour 2824 derivatives rather than original 2824-2s.
Watches that have used it
Hamilton Khaki Field (most automatic refs, pre-H-10), Tissot Le Locle, Tissot PR100, Mido Commander/Multifort, Certina DS-1/DS Action, Tudor Submariner 7928 (vintage), Tudor Heritage Black Bay (pre-2016 MT5612), Sinn 556, Damasko DA34, Squale 1521, Steinhart Ocean One, Stowa Marine, Junkers 6060, Davosa Ternos, plus thousands of microbrand divers and field watches between 1985 and 2020. If you bought a sub-CHF 1,500 Swiss-made automatic between those years and it is not branded as in-house, statistically it is a 2824-2 base.
Service notes
A 2824-2 service costs CHF 200-300 at a competent independent and CHF 350-550 at the brand. The mainspring always gets replaced; jewels typically last decades; rotor bearing wears next. Service interval: every 5-7 years for daily wear. Like the 2892, the 2824-2 has a steel Nivarox hairspring in most grades, which is more magnetism-sensitive than a silicon hairspring. A demagnetiser is the cheapest tool any owner of a 2824-2 watch can buy. The 2824-2 itself is alive and well at ETA but external sales are restricted; for new microbrand work, the Sellita SW200-1 is the de-facto modern equivalent.
