ETA 2600 Series

The ETA 2600 family of movements was produced in the 1960s-1970s. The calibers from the 2600 series are considered to be predecessors to the ubiquitous ETA caliber 2824-2 framework that most watch enthusiasts are familiar with today.

Calibers in the ETA 2600 series:

• ETA 2600 – Manual wind, 11.5”’, 21,600 bph, time-only (no date)
• ETA 2602 – Manual wind, 11.5”’, 21,600 bph, date
• ETA 2603 – Manual wind, 13”’, 21,600 bph, date
• ETA 2608 – Manual wind, 11.5”’, 21,600 bph, day/date
• ETA 2609 – Manual wind, 13”’, 21,600 bph, day/date
• ETA 2612 – Manual wind, 11.5”’, 21,600 bph, quickset date
• ETA 2618 – Manual wind, 11.5”’, 21,600 bph, quickset day/date
• ETA 2620 – Automatic, 11.5”’, 21,600 bph, time-only (no date)
• ETA 2622 – Automatic, 11.5”’, 21,600 bph, date
• ETA 2623 – Automatic, 13”’, 21,600 bph, date
• ETA 2630 – Automatic, 11.5”’, 21,600 bph, day/date (quickset date)
• ETA 2632 – Automatic, 11.5”’, 21,600 bph, quickset day/date
• ETA 2638 – Automatic, 11.5”’, 21,600 bph, quickset day/date
• ETA 2637 – Automatic, 11.5”’, 21,600 bph, quickset date
• ETA 2639 – Automatic, 13”’, 21,600 bph, quickset day/date

ETA 26XX Similarities and Differences:

The one feature that the calibers in the ETA 26XX family of movements shares is that they all have a beat rate of 21,600 bph. Differences between the caliber numbers mainly come down to movement type (auto vs hand-wound), size (11.5 vs 13 lignes), and calendar complication (no-date, date, day/date, quickset and non-quickset).

Similar Families:

The ETA 2500 family of movements is similar to the 2600 series, but with a lower beat rate of 18,000 bph vs the 2600’s 21,600. There is also a 2700 series with a similar framework as the 2500 and 2600 line, but with hi-beat offerings of 28,800 and 36,000 bph.

Additional Resources:

• More ETA movements