| Manufacturer | ETA |
| Caliber Number | 2688 |
| Base Caliber | ETA 2681 |
| Movement Type | Automatic, self-winding mechanical |
| Lignes | 8.75”’ |
| Diameter | 19.4mm |
| Height | 5.35mm |
| Jewel Count | 17 |
| Beat Rate | 21,600 vph, 3 Hz |
| Lift Angle | 51 degrees |
| Power Reserve | 38 hours |
| Rotor Style | Ball-bearing |
| Hand-Windable? | Yes |
| Anti-Shock Device | Incabloc |
| Regulator | Etachron with micro-adjuster |
| Hand Count | 3 |
| Hand Sizes | 1.2mm / .70mm / .20mm |
| Functions | Central hours; central minutes; central seconds; day/date at 3:00 |
| Hacking Seconds? | Yes |
| Country of Manufacture | Switzerland, Swiss made |
| Known Models | (Add your watch to the comments below…) |
ETA caliber 2688 is a smaller ladies size automatic watch movement with a day/date complication. This caliber is part of ETA’s 2600 family of movements and was categorized as a Mecaline movement when it was produced. Official technical documentation was found dated as far back as 2005, with updates as recent as 2010.
ETA 2688 Tech Sheets (pdf):
Additional Resources:
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