ETA 2600 Series

Manufacturer	ETA
Caliber Family	2600
Movement Type	Manual Wind / Automatic
Lignes	11.5”’ / 13”’
Power Reserve	~38 hours
Vibrations Per Hour	21,600 bph, 3 Hz
Lift Angle	52 degrees
Shock Protection	Incabloc
Country of Manufacture	Switzerland, Swiss made
Known Models	(Add your watch in the comments below…)

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