Are Casio G Shock watches good for diving? If yes, what depth can they go to before they stop being water resistant or waterproof (for example)? - Quora
Vintage Very Rare 1992 CASIO DW-340 1000 Japan M 300M WR - Etsy Finland
CASIO DW-300 HD QW-548 VINTAGE 1984, Men's Fashion, Watches & Accessories, Watches on Carousell
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Which Casios are rated WR 300M or deeper? | WatchUSeek Watch Forums
CITIZEN 300M Shock-Resist P130 from 1985 vs G-Shock DW-5000c 1983 - Exclusive First to WatchUP69 - YouTube
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CASIO G-SHOCK Full Metal Square Black 5000 GMWB5000GD-1 Watch Steel – NAGI