Named for the Aircraft Mfg. Co. Ltd, one of the first British military aircraft manufacturers, Bremont’s 2 new Airco automatics are constructed using their 3-piece Trip-Tick’ cases which are produced in the UK & house the chronometer-rated BE-92AE movement. Both 40mm in diameter, the Mach 1 model features a satin-finish hardened stainless case. The case for the Mach 2 is a polished anthracite finish.