Speedmaster Mark IV 176.0009

Mark II-style cushion case (about 45.3 mm long, 15 mm thick) with the automaticAutomaticA mechanical movement wound by a rotor as the watch moves on the wrist. caliberCaliberThe designation of a watch movement, identifying its design or movement family. 1040 of the Mark III; sold on a 1162 bracelet or corfam strap. Marketed for only a few years.