It appears to be an Eta 2622:
Specifications ETA 2622 (2622R) automatic movement:
Features ETA 2622 (2622R) movement:
automatic
sweep second
date: set by changing 20-24h
Data:
11.5", Dm= 25.6mm, H= 4.65mm (H= 4.8mm)
21/25 jewels
f = 21600 A/h
power-reserve 42h
Remarks:
1963- (1965-)
ETA 2622: like 2622R, but without ball-bearing rotor
ETA 2622: Example, year: signature; shock device
ca. 1965: 25 Jewels; Incabloc, (ETA 2522, 18000 A/h)