|Jewels:||17, 21, 25|
|Winding:||Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding|
|Diameter:||25.60 mm (11.5 ligne)|
|Complications:||Bilingual Day Wheel, Date, Day, Instant Date Change, Instant Day Change, Quick Date Correction, Quick Day Correction|
|Hands:||Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00, Day Window at 3:00|
|Distinguishing Technical Characteristics|
Counter-Clockwise Balance Cock
In the 1970s, two Ebauches SA subsidiaries, ETA and FHF, produced lines of movements that were designed to be interchangeable. These “Gabarit” (“Template” in English) movement families were ETA’s 2850 and FHF’s 400. Although newer in design than the ETA 2800 family, the ETA 2850 came too late and the project was cancelled after a short production period of just a few years.
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.
|Time-Only||ETA 2851||ETA 2850||ETA 2871||ETA 2870|
|Date||ETA 2853||ETA 2852||ETA 2873||ETA 2872|
|Day-Date||ETA 2859||ETA 2858||ETA 2879||ETA 2878|