Details
Citizen Miyota automatic winding caliber 8203A, 11.5 lines = diameter = 25.6 mm, thickness = 5.2 mm (thickness with date wheel and rotor = 5.67 mm), f = 21.600 A/h, sweep second, date with quickset. Power reserve 45h. Known difference between 8200A and 8203A: hairspring stud carrier. Accuracy of the Miyota 8203 watch movement is rated better than the 8204 at -10/+20 sec/day vs -20/+40 sec/day for the 8204. The Miyota caliber 8203 is a 21 jewel automatic watch movement, first introduced in 1977. This watch movement is from the Miyota 8200 family (aka 8 or 82 series) of movements. This 8203A has been discontinued by Miyota/Citizen and is no longer offered in their catalog of movements. It has evolved into the current Miyota caliber 8205.