Miyota Caliber 8245

Brand	Miyota (Citizen)
Caliber Number	8245
Base Caliber	Miyota 8215
Movement Type	Automatic
Lignes	11 1/2”’
Diameter	26mm
Casing Diameter	25.6mm
Height	5.67mm
Jewel	21
Vibrations Per Hour	21,600 bph
Power Reserve	40 hours
Lift Angle	49 degrees
Stem	065-212
Movement Holder	500-710
Hand Size	1.52mm / 1.0mm / 0.17mm
Anti-Shock System	Parashock
Hacking Seconds?	No
Hand-Winding?	Yes
Hand Count	3
Functions	Central hours; central minutes; small seconds subdial between 4:00 and 5:00
Country of Manufacture	Japan
Known Models	NAM Mahameru (Add your watch in the comments below)

The Miyota caliber 8245 is an automatic no-date with a small seconds complication. This movement is a member of the affordable 8 Series family of what Miyota refers to as “Standard Automatics”, further categorized as “Small Hands”. As of 8/2022, this caliber is no longer present in Miyota’s current catalog.

Small Seconds:

Caliber 8245 is based off of 8215/821A framework but with a small seconds subdial in the 4:30 region rather than a central sweeping seconds hand. This small seconds hand option may be a good solution to the Miyota jumping seconds that so many watch collectors experience with other 82XX calibers. Since the seconds hand is smaller and not centralized, any stuttering or jumping may not be as noticeable. Please comment below if you have this caliber and have experiences it.

Miyota 8245 VS 8247:

There is a similar Miyota caliber 8247 with the main difference being that the 8247 has an additional 24 hour hand complication located at 9:00. Other than that, these two calibers are the same.

8245 VS 8218:

The caliber 8218 is the same as the 8245 but without a calendar complication. The caliber 8218 has a date at 3:00.

Accuracy & Power Reserve:

Miyota claims that the caliber 8245 offers accuracy of -20 ~ +40 seconds per day under normal operating temperatures, and when measured with a full power reserve.

“Accuracy of the mechanical watch is different from the daily rate of the quartz watch and the accuracy will change maximum of several ten seconds during rewinding the spring, then the accuracy of the half winding condition will be different from that of full winding condition.” -Miyota official tech sheets

When fully wound, the power reserve is about 40 hours of running time. To reach full power reserve via manual winding, turn the crown 40 times.

Replacement Prices:

At the time of this post, replacement prices for the caliber 8245 were found online for around $49.95 USD. Supply seems to be limited since this exact caliber number appears to be discontinued and no longer offered by Miyota.

Additional Resources:

• List of Miyota movements