ETA 2770

Calibre 2770 was one of a family of automatic movements from ETA produced from 1969 through 1982. In all, over 25 million examples were made.

Overview

This family of 11.5 ligne movements included both hand winding and automatic variants. Nearly every model has a corresponding model with or without automatic winding. Both 21,600 A/h and 28,800 A/h versions were made of many of these movement as well.

All members of the family are 11.5 ligne in diameter (25.6 mm) and have 17, 21, or 25 jewels. 21,600 A/h models have a power reserve of 48 hours, while 28,800 A/h models have 45 hour power reserve. The non-date and date-only movements are 5.2-5.3 mm thick, while the day/date (and some date-only) versions measure 5.9-6.0 mm thick.

Variants

Speed (A/h)	Movement	Corresponding Hand-winding	Years Made	Height	Notes
21,600 A/h	ETA 2770 ETA 2776	ETA 2750	1969-1982	5.3 mm
	ETA 2772	ETA 2752	1969-1982	5.3 mm	Date
	ETA 2773	ETA 2753	1969-1982	5.3 mm	Date, Triovis regulator
	ETA 2778	ETA 2758	1969-1982	6.0 mm	Date, day
	ETA 2779	ETA 2759	1969-1982	6.0 mm	Date, day, Triovis regulator
	ETA 2781	ETA 2761	1969-1982	5.9 mm	Quickset date
	ETA 2782	ETA 2762	1969-1982	5.3 mm	Quickset date
	ETA 2783	ETA 2763	1969-1976	5.2 mm	Quickset date, different stem
	ETA 2788	ETA 2768	1969-1982	5.9 mm	Quickset date, day
	ETA 2789	ETA 2769	1969-1976	5.9 mm	Quickset date and quickset day
	ETA 2789-1	ETA 2769-1	1976-1980	5.9 mm	Quickset date and quickset day with 2 languages
28,800 A/h	ETA 2771	ETA 2751	1971-1980	5.2 mm
	ETA 2774	ETA 2754	1971-1980	5.3 mm	Date
	ETA 2780	ETA 2760	1968-1970	5.9 mm	Date, day
	ETA 2784	ETA 2764	1971-1978	5.2 mm	Quickset date
	ETA 2790	None	1970-1976	5.9 mm	Quickset day and quickset date
	ETA 2790-1	None	1976-1980	5.9 mm	Quickset day and quickset date with 2 languages
	ETA 2791	None	1970-1976	5.9 mm	Quickset date

Note: Some dates are approximate for the entire family of movements

See Also

• ETA 2750