This is the original, brushed, watch-case-protector / case body for the Seiko Prospex Marine Master 300 Tuna Diver

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

7C46-0AG0, 7C46 OAGO

7C46-0AF0, 7C46-0AC0, 7C46-7010, 7C46-7011

Seiko models:

SBBN031, SBBN031J, SBBN033, SBBN033J, SBBN037

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