The Hamilton Intra-Matic Auto Chrono is a watch inspired by a Hamilton chronograph from 1968. In this modern iteration the case measures 40mm across, whilst holding a self-winding movement with chronograph in the form of caliber H-31. Ref. H38416711 has a silver dial with black counters and a black tachymeter scale. Introduced in 2018, it is 2mm smaller in diameter than the limited edition H38716731 that preceded it.