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Brand: | ETA | 
|
|---|---|---|---|
| Family: | |||
| Height: | 5.35 mm | ||
| Jewels: | 17 | ||
| Reserve: | hours | ||
| Frequency: | 21600 A/h | ||
| Winding: | Automatic, Central Rotor Automatic Winding | ||
| Diameter: | 19.40 mm (8.75 ligne) | ||
| Image from TimeConnection.com | Complications: | Date, Day, Hacking Seconds, Instant Date Change, Instant Day Change, Quick Date Correction | |
| Hands: | Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00, Day Window at 3:00 | ||
| Distinguishing Technical Characteristics | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
 Central-Rotor Automatic  Etachron Regulator |
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| Production: 1981 – 2001 | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Cal. 2688 is part of ETA’s regular “Mecaline” line. It was introduced in 1981 and produced through 2001.
ETA produced a variety of movements in the 2600 family since the 1970s. This includes both automatic and hand-winding variants, 7.75 and 8.75 ligne sizes, and 21,600 A/h and 28,800 A/h versions. In the table below, 8.75 ligne movements are denoted with an asterisk and currently-produced movements in bold.
| Hand 21600 | Hand 28800 | Auto 21600 | Auto 28800 | |
| Base | 2640 | 2660 | 2650 | 2670 |
| Date | 2641 2691* | 2661 | 2651 | 2671 2681* |
| Day/Date | 2648 | 2668 | 2658 2688* | 2678 |
| Date Moon Phase | 2675 2685* |
