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.
Movement Type
Automatic
Jewel Count
21 jewels
Power Reserve
42h
Frequency
21,600 vph (6 Hz)
Diameter
26mm
Height
5.67mm
Display Type
Analog
Rotor Type
unidirectional
BRAND
MiyotaTYPE
AutomaticSTATUS
In ProductionMANUFACTURE
ÉbaucheCALIBER FAMILY
Miyota 8-SeriesCOUNTRY
JapanALSO KNOWN AS