The Bulova 9AS watch movement was introduced in the period from 1950 to 1954 and belongs to the first gents automatic-family with a ball-bearing rotor. The movement underwent modifications, including a shift from a T- to U-shaped shock device and a modified calibre. Several variants were produced, although it is uncertain if all calibres were made in the TC variant. Signatures of the UT versions were also changed to UC. The movement features automatic winding, a sweep second hand, and a date function.