Nice vintage, many compliments
Features
manual-wind chronograph, 60s, 30/45min, cam switched
sub second
Data
13.75''', Dm= 31mm, H= 6.2mm
17 jewels
f = 18000 A/h
power reserve 43h
Remarks
1937-1970, >3.500.000 (whole 48-family)
Example, year: signature; shock device
ca. 1955: Swiss Made, 17 Jewels