This is the original black case-protector / case body for the Seiko Prospex Baby Tuna Superior Diver

This protector is suitable for among other the following calibre- / case numbers:

4R36-03Z0, 4R36 O3ZO, 

Seiko models:

SRP641, SRP727

SRP641K1, SRP641J1, SRP727K1

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