CASIO EDIFICE - The new EDIFICE EFR-S567D slim chronograph utilizes sapphire crystal, which is hard to scratch. This keeps the watch face clear. https://products.edifice-watches.com/asia-mea/en/_detail/EFR-S567D-2AV/ | Facebook
Casio] Duro with sapphire crystal replacement + comparison with unmodified Duro. : r/Watches
New Transparent G-Shock Watches Bring Sapphire Crystal Vibe to Masses - Bloomberg
Casio Edifice Sporty Sapphire Crystal Solar Watch EFS-S500DB-1B | eBay
Premium Model' Sapphire Crystal G-Shock revealed
Sapphire crystal in any Casio? Show 'em! | WatchUSeek Watch Forums