Seiko 8305 Movement Details

Seiko caliber 8305 is an automatic watch movement. Production started around 1964.
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Sub-brands: Sea Lion, Seikomatic-R
Day / date?Date only
GMT / world time?No
Rate:18,000 bph
Number of jewels:30
Size / diameter:28.6mm
Development division:Suwa (Nagano)
Notes:The same as cal. 8306 but without day display (date only).
Related movements: 830 8306 8325 840