Omega 311. Speedmaster Professional "SAPPHIRE SANDWICH" (34537)

34537 Omega Speedmaster Professional 311. 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, latest edition with commemorative box set with accessories (including two additional straps), diameter: 42mm, thickness: 14mm. Like New with Presentation Box, Additional Straps, Loupe, and undated papers.


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More about Omega 311. Speedmaster Professional "SAPPHIRE SANDWICH"

This is a stainless steel Omega Speedmaster Professional Sapphire Sandwich 311. It has an integral stainless steel bracelet with an Omega double deployant clasp, and a scratch-resistant sapphire dual crystal ("sandwich") with anti-reflective treatment on both sides. The screw-down solid polished case back reads: "OMEGA - THE FIRST AND ONLY WATCH WORN ON THE MOON." The black bezel has a tachymeter scale to 500 UPH, round chronograph pushbuttons, and a screw-down winding crown protected by a crown guard. The 42mm diameter solid three-body case, straight lugs, and flat revolving bezel are polished/brushed. The dial is black with luminous baton hands, a luminous center sweep chronograph hand, and luminous baton hour markers around an outer minute/one-fifth second track. There are three registers, including a constant small seconds subsidiary dial at 9 o'clock, a 12-hour chronograph indicator at 6 o'clock, and a 30-minute totalizer at 3 o'clock. It has a 48-hour power reserve at full wind, and it's water resistant to 50 meters/165 feet. The 13.5mm thick case, dial, and movement are all signed.

This Omega Speedmaster Professional Sapphire Sandwich 311. has a mechanical manual winding Omega caliber 1863 movement that is the same chronograph movement that was used on the Moon. It's rhodium-plated, and the baseplate has circular graining. The bridges have cotes-de-Geneve embellishment; levers and bridges have polished edges. It's constructed with 18 jewels, a shock absorber device, and a straight-line lever escapement. It includes a monometallic balance, a self-compensating flat balance spring, and an index regulator. The mechanism oscillates at a frequency of 21,600 vph (3 Hz). The 14mm thick case, dial, and movement are all signed.

This Omega Speedmaster Professional Moonwatch Sapphire Sandwich 311. was produced from 2014 to 2016.