Miyota 82S7

Entry-level automatic movement used in various Bulova automatic watches. Manufactured by Miyota (owned by Citizen Group, same parent company as Bulova since 2008). The 8215 is the base caliber with date, while 82S7 features skeleton/open-heart display. Unidirectional rotor winds in counter-clockwise direction. Accuracy specification of -20 to +40 seconds per day. Non-hacking in earlier versions. A reliable and economical Japanese automatic movement found in many Bulova automatics, particularly in the lower-to-mid price range. The 8315 variant adds hand-winding capability.