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  1. 4006-7010 Bell Matic display case back

    BELLMATICS FORUM
    Hi, I have a lovely Seiko Bell Matic 4006-7010 (the 27 jewels version) that I inherited from my grandfather and I want to put a window display case back on it so I can see the movement and the alarm. The diameter of the entire case back is 33 mm, the outside thread diameter is 31.5 mm and the...
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