Seiko 10 Movement Details

Seiko calibre 10 is a hand winding watch movement. Production started around 1926.
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Day / date?	No
GMT / world time?	No
Chronograph?	No
Rate:	18,000 bph
Number of jewels:	3, 7, 10 or 15
Size / diameter:	10.5"
Notes:	Has small seconds sub-dial. The 10A version was produced from 1946 with a 10B version appearing in 1948 produced at Daini's Kameido factory.

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