Miyota Caliber GM02

The Miyota caliber GM02 is a quartz movement with a day-date calendar complication. This calibre is part of Miyota’s “Slim” line of quartz movements.

In Miyota’s own words:

“Slim movement. Ideal for designs with a thin profile. Multiple variations in size and day-date display.”

Some of the features of this movement are that it’s hour wheel is already assembled; it is dust proof; the coil is covered to avoid scratching during a battery change; the date adjusting the super quick; and it is easy to assemble on a flat desk.

Similar Calibers:

There is a similar caliber GM12 with the main difference being that the GM02 has a day-date and the GM12 only has a date. All other specs appear to be the same.

Interchangeability:

Sometimes this caliber number is confused with a similar cal. “6M02”. The GM02 is considered to be an interchangeable upgrade from the 6M02.

As of this post, the GM02 is part of Miyota’s current catalog, while the 6M02 has been discontinued.

Replacement Prices:

At the time of this post, replacement prices for the GM02 were found in the range of $5.70 USD to $22.00 USD.

Important Notes About Setting the Date:

According to official technical documentation, Miyota states the following about changing the day/date:

• Do not set the date when the hands are between the hours of 9:00 PM to 1:00 AM
• Do not set the day between 11:15 PM to 6:00 AM

This is when the day/date setting mechanism is activated and forcing the calendar forwards could disrupt the system or even break the components.

Additional Resources:

• Official GM02 tech drawings (pdf)
• Official GM02 instruction manual (pdf)
• More Miyota mentions