38+ Omega Speedmaster Professional Sapphire Sandwich US. I discuss the draws, the drawbacks, and touch on the future of the model. Internally the sapphire sandwich was identical to the reference 3572.50 and still featured omega's caliber 1863 movement visible through its sapphire crystal display.
(35585) omega speedmaster professional 311.30.42.30.01.006 sapphire sandwich, 31130423001006, 'first watch worn on the moon', stainless steel on a stainless steel bracelet, manual wind movement, chronograph, black dial, water resistant to 100ft, sapphire crystals front and back.
Always upvote the sapphire sandwich. Omega speedmaster chronograph racing automatic. The sapphire sandwich with its front and caseback crystals, is also popular. Exhibition sapphire crystal case back.