The Bulova 2185 watch movement, introduced in 1969, features an electromechanically controlled balance motor and a back crown that locks the balance in position for reliable starting upon pushing the crown. Its am/pm display is indicated by a dot below or above the date numeral, which advances half a day with one setting of the hands. The date can be set at noon and midnight, with attention to ensuring the correct dot position. The movement often or always bears the signature along with the Durowe number 881. Additional functions include a jumping sweep second, date adjustment by changing 22:30-24h, and an electrical and mechanical hack feature.