Seiko 10 Movement Details

Seiko caliber 10 is a hand winding watch movement. Production started around 1926.
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Day / date?No
GMT / world time?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.
Seiko caliber 10B in a model 1740 watch from around 1955. Photo by Mizeni.