329.92.43.51.10.001 Omega. The Omega Speedmaster Co-Axial Master Chronometer Chronograph 329.92.43.51.10.001 is a luxurious watch with a 43mm 18K bronze gold case, which gives it a vintage feel. The watch features a polished brown ceramic bezel ring with a tachymeter scale in "vintage" enamel and an 18K bronze gold crown. The oxidised bronze dial is designed with a special patina and opaline finish and features silvery subdials with a small seconds sub-dial at 9 o'clock and a 60-minute and 12-hour recorder at 3H. The leaf-shaped hands and Arabic numerals also feature an 18K Bronze Gold PVD coating, and a unique "spiral" track pattern runs beneath the numbers. The dial is printed with three distinctive timing scales in a 1940s "snail" design, including a tachymeter scale, a pulsometer scale, and a telemeter scale. The watch performs several functions, including hours, minutes, seconds, tachymeter, small seconds counter, chronograph, chronometer, pulsometer, anti-magnetic, time zone function, and telemeter. The Omega logo is located below the 12 o'clock position, and the watch is powered by a self-winding mechanical movement powered by a Calibre 9908, which provides a power reserve of approximately 60 hours. The case thickness is 12.8mm, and the case back is transparent. Sapphire crystal protects both the front and back side of the watch. The watch comes with a brown calf leather strap with a pin buckle and has water resistance up to 50 meters, making it suitable for everyday wear. Overall, the Omega Speedmaster Co-Axial Master Chronometer Chronograph 329.92.43.51.10.001 is a high-end timepiece that combines vintage appeal with modern technology, making it a popular choice among watch enthusiasts and collectors.