Seiko 8306 Movement Details

Seiko caliber 8306 is an automatic (with hand winding) watch movement. Production started around 1965.
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Sub-brands: Business-A, Weekdater, Seikomatic-R, Sea Lion, Seikomatic
Day / date?Day + date
GMT / world time?No
Chronograph?No
Rate:18,000 bph
Number of jewels:30
Size / diameter:28.6mm
Height:4.8mm
Development division:Suwa (Nagano)
Notes:The same as cal. 8305 but with day display (as well as date).
Related movements: 830 8305 8346 840

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