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Watch is an SBBN025 case code 7C46-0AH0.
My ignorance is attacking me. I used to have a link for a Seiko parts finder but the old link does not work and a newer site I've found just doesn't have this case code listed.

I would really appreciate any help.
 

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Perhaps it is i.d. 38.8mm x 0.90mm, Cousins nearest is 37.80mm x 0.90mm, which using the o ring 5% rule means its possible to stretch upto 38.80mm
 
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