Speedmaster Chronoscope Co-Axial Master Chronometer Chronograph 43MM Watch
This 43 mm model is crafted in stainless steel with a silvery dial with blackened subdials. Along with a black anodized aluminium bezel ring with its tachymeter scale, the leaf-shaped hands and Arabic numerals are also blackened, with a unique “spiral” track pattern running beneath the numbers.
Most notably, the 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. Presented on a perforated black leather strap with a red interior.