With three sub dials revealing a tachymeter to measure speed, distance and pulse, this OMEGA Speedmaster Chronoscope Co‑Axial Master Chronometer Chronograph Men\'s Watch is inspired by the 40s chronograph wristwatches. At A Glance  Presented on a stainless steel bracelet 43mm case size with 50m water resistance Silvery dial with blackened sub dials and black anodized aluminium bezel ring with tachymeter scale Leaf-shaped hands and Arabic numerals in blue, with a unique “spiral” track pattern running beneath the numbers Dial is printed with three distinctive timing scales in a 1940’s “snail” design, including a tachymeter scale, a pulsometer scale and a telemeter scale Black small-seconds counter at 9H, and a black 60-minute and 12-hour recorder at 3H with red hands Scratch‑resistant sapphire crystal with anti‑reflective treatment on both sides Powered by the manual-winding OMEGA Co-Axial Master Chronometer Calibre 9908 Power reserve of up to 60 hours