Seiko 4006 Movement Details

Seiko caliber 4006 is an automatic watch movement produced from around 1966 until 1978.

Sub-brands: Bell-matic, Business Bell
Day / date?Day + date
GMT / world time?No
Chronograph?No
Hacking?No
Rate:19,800 bph
Number of jewels:17, 21 or 27
Lift angle:58.4º
Size / diameter:31.2mm
Height:7.15mm
Stem code: 354805
Balance wheel code: 310470
Mainspring code: 401805
Notes:The same as cal. 4005 but with day display (as well as date). It has a 10-second mechanical alarm feature powered by a second mainspring.
PDF guides: Technical guide for 4006A
Related movements: 4005

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