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12.5''', Dm= 28.2mm
f = 18000 A/h
power reserve 36h
Balance staff U1696
Mainspring / battery
Zf931, 1.35 x 8.0 x 0.09 x 250mm
1.32 x 0.80 x 0.20mm
Comments about the data
1948-1955 (138SS, 139)
differences not known between 138SS, 139
138: sub second
138C: sub second, date
138SS, 139: sweep second
Example, year: signature; shock device
1951: Universal Geneve, Swiss; Incabloc
Not for Sale!
The movements presented in this caliber finder are not for sale. This is only a data sheet for identification and evaluation of the movement calibre, as well as for approximate dating.
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