ETA 2660 caliber vs ETA 2681 caliber: specs compared
Updated 05 September 2026.
6
specs differ
ETA 2660 caliber and ETA 2681 caliber differ on 6 specs: size, casing diameter, jewels, calendar / layout, stem, power reserve.
| Spec | ETA 2660 caliber | ETA 2681 caliber |
|---|---|---|
| Maker | ETA (Swatch Group) | ETA (Swatch Group) |
| Size | 7 3/4 ligne | 8 3/4 ligne |
| Casing diameter | 17.20 mm | 19.40 mm |
| Movement height | 4.80 mm | 4.80 mm |
| Frequency | 28,800 A/h (4 Hz) | 28,800 A/h (4 Hz) |
| Jewels | 17 | 25 |
| Winding | automatic, bidirectional | automatic, bidirectional |
| Calendar / layout | centre seconds, no date | centre seconds, date at 3 |
| Hand fitting | small-caliber hour / minute / second bores | small-caliber hour / minute / second bores |
| Stem | 2660 stem | 2681 stem |
| Power reserve | approx. 40 h | approx. 38 h |
Questions and answers
How do ETA 2660 caliber and ETA 2681 caliber compare?
ETA 2660 caliber and ETA 2681 caliber differ on 6 specs: size, casing diameter, jewels, calendar / layout, stem, power reserve.