First production: c.1910
Version: 1928
17.66″‘ (39.75mm)
Height: 7.45mm
One pusher
Counter: 30min
Modified: c. 1945
Sport chronograph with or without split-second
First production: 1916
Version: 1947
19″‘ (44.10mm)
Height: 7.45mm
One pusher
Counter: 30min
Sport chronograph with split-second
End of production: 1970
First production: 1916
Version: 1928
19″‘ (43.00mm)
Height: 7.45mm
One pusher
Counter: 30min
Sport chronograph with or without split-second
Modified: c. 1945
End of production: 1970
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