ETA / Unitas 6498-1 caliber vs ETA 2660 caliber: specs compared
Updated 05 September 2026.
9
specs differ
ETA / Unitas 6498-1 caliber and ETA 2660 caliber differ on 9 specs: size, casing diameter, movement height, frequency, winding, calendar / layout.
| Spec | ETA / Unitas 6498-1 caliber | ETA 2660 caliber |
|---|---|---|
| Maker | ETA (Swatch Group) | ETA (Swatch Group) |
| Size | 16 1/2 ligne | 7 3/4 ligne |
| Casing diameter | 36.60 mm | 17.20 mm |
| Movement height | 4.50 mm | 4.80 mm |
| Frequency | 18,000 A/h (2.5 Hz) | 28,800 A/h (4 Hz) |
| Jewels | 17 | 17 |
| Winding | manual | automatic, bidirectional |
| Calendar / layout | small seconds at 6 | centre seconds, no date |
| Hand fitting | hour / minute / small-second sub-hand | small-caliber hour / minute / second bores |
| Stem | 6498 stem | 2660 stem |
| Power reserve | approx. 46 h | approx. 40 h |
Questions and answers
How do ETA / Unitas 6498-1 caliber and ETA 2660 caliber compare?
ETA / Unitas 6498-1 caliber and ETA 2660 caliber differ on 9 specs: size, casing diameter, movement height, frequency, winding, calendar / layout.