OMEGA Speedmaster Chronoscope

Omega's Speedmaster Chronoscope, reference 329.92.43.51.10.001, is a chronograph housed in a 43 mm bronze case. The case measures 12.8 mm thick with a lug-to-lug span of 48.6 mm, and the brown dial sits under a sapphire crystal treated with anti-reflective coating on both sides. Inside is the manual-winding calibre 9908, a Master Chronometer certified movement with column wheel and Co-Axial escapement, built on a silicon balance spring with two barrels in series and a power reserve of 60 hours. Alongside its chronograph function, the watch has a tachymeter scale and a small seconds counter. A display back shows the movement. The brown leather strap closes with a bronze pin buckle, and that same bronze case carries a 50 metre water resistance rating.