The Bulova 7AP watch movement, introduced in 1925, is one of the thinnest movements available. It has been surpassed in recent years by the Audemars Piguet 2003, which measures at 1.64mm, but it remains highly regarded in terms of its slimness. The movement features an escapement wheel in Lubrifix 66, later replaced by Kif Duofix, and since around 1985, it has been equipped with the Kif Ultraflex shock absorber. The Bulova 7AP movement is a manual wind, ultra-thin movement that has been used since its introduction in 1925.