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
Lift angle:53º
Size / diameter:28.6mm
Development division:Suwa (Nagano Prefecture, Japan)
Notes:The same as cal. 8306 but without day display (date only). Unusually, the date is quickset in both directions. The automatic winding mechanism does not use Seiko's famous "magic lever" system – instead it has an integrated wheel system, making the movement slimmer.
Related movements: 830 8306 8325 840


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