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Discussion Starter #1
Hi chaps,

Will a MS with c/s of 1mm x 0.1mm be too weak for Seiko 6309 dive watch?

Cheers

Bry
 

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The replacement 6309 mainspring is:
1.05 x .115 x 420 x 10.5 Automatic
Product code at Cousinsuk.com is GR2534X.

I would just buy that knowing its definitely going to work.
 
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