Movement

Calibre 37.9M

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1932 – 1939

Lignes 16.75
Mounting Diameter 37.9
Thickness 3.85
Frequency (vph) 18,000
Jewels 17
Power Reserve 38
Hand Sizes 1.70, 0.90, 0.26
Complication Subsidiary Seconds
Power Manual
Shape Round
Size Pocket
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Technical Diagram

An example from 1936

Notes

The 37.9M was designed around the same time as the 37.9 and 37.9ABC and was part of a scheme to make the same basic movement architecture, using mostly the same tooling but at three different thicknesses. M means "mince", thin in French.

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