Zenith caliber 2540 is Swiss movement from 1950s.
Functions: sweep second, date: set by changing 20:00 – 24h (not quickset)
Manual-winding movement with 17 jewels.
F = 18000 A/h
Power reserve: 50 hours
Diameter: 25.6 mm
More parts for Zenith 2522C can find here
