Japanese Mechanical Movements

Automatic mechanical watch movement Caliber Citizen Miyota 6T51 • Outside Diameter: 8 3/4 Ligne or 19.4mm • Movement 5.58 mm thick • Day and date display at 3:00 • Requires watch hands: hour 1.20 mm, minute 0.70 mm, and sweep second 0.17 mm. These Miyota watch movement has 21 jewels • 28800 vibrations per hour. These mechanical replacement watch movements are made by the Miyota division of Citizen LTD to fit many genuine Citizen, Bulova, Miyota, Wittnauer and many more wrist watches. Learn More

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. Learn More

Miyota 8205 automatic watch movement. Size 11.5 ligne, (25.6mm) 5.67mm thick, 21 jewels, parashock, automatic - unidirectional winding, 21,600 vph, power reserve 45 hours. Hour, minute, central seconds, quickset day and date. Hand sizes from this watch movement are 1.00, 1.50 and 0.17 mm. Accuracy & Power Reserve: Miyota claims the caliber 8205 has an accuracy rating of -20 ~ +40 seconds per day. This is only measured within 10 to 60 minutes from a full power reserve. Power reserve or fully wound running time is about 42-45 hours. The Miyota caliber 8205 is a 21 jewel automatic watch movement. It is made in Japan and is found in many new microbrand watches because it is easily obtainable, low cost, and considered an entry level workhorse movement. This time-tested watch movement was introduced to the watch market around 1977. Learn More

The Miyota 8215 is a Japanese automatic wristwatch movement that is used by many watchmakers (and watch factories). Miyota is part of the Citizen group of companies. It is a non-hacking 21 jewels movement with a unidirectional winding system (left rotation) with accuracy of -20 to +40 seconds per day, and a power reserve of over 40 hours. The diameter of the movement is 26 mm and the thickness is 5.67 mm. It beats at 21,600 BPH. Learn More

The Miyota caliber 9015 is a 24 jewel automatic watch movement. It is made in Japan and was first introduced in 2009. This movement is found in many new microbrand watches because it is easily obtainable, has a desirable hacking function, and considered a workhorse watch movement. Size 11.5 ligne = diameter 26.0mm, 3.9mm thick, 3 hands with date (3h), 28,800 vph. Automatic watch movement with unidirectional winding rotor, 51 degree lift angle. Citizen Miyota claims the accuracy of the caliber 9015 to be within -10~+30 seconds per day. Power reserve: More than 42 hours, 7.5 crown rotations to full wind (about 40 turns). Hand Size 1.52mm, 1.00mm and 0.17mm. Learn More