Pre-owned Omega Speedmaster watch reference number 30542316 case size is 38mm features a black stainless steel round face with sapphire crystal glass mother-of-pearl dial baton hands and chronograph counters the bezel is diamond-encrusted it has two chronograph pushers a screw-down crown and comes equipped with an automatic movement water resistance up to 100m or 10 ATM includes a stainless steel link bracelet with folding clasp