Omega certainly knows this ... Flip the watch over, and you’ll find a sapphire display caseback — but immediately you’ll realize this isn’t your run-of-the-mill Sapphire Sandwich.

Sapphire crystal protects the front and back, with the latter presenting a view of Omega’s Co-Axial Master Chronometer Calibre 9900 self-winding mechanical movement with 60-hour power reserve.