Ronda Caliber 712 Watch Movement

Brand	Ronda
Caliber Number	Ronda 712
Type	Quartz
Linges	11 1/2”’
Total Diameter	26mm
Casing Diameter	25.6mm
Height	2.5mm thick
Dial Feet	2:30 and 8:30
Battery Cell Number	371 (SR920SW)
Claimed Battery Life	60 months
Jewels	5 (Swiss parts variant has 1 jewel)
Hacking?	Yes
Functions	Hours, minutes
Country	Switzerland (Swiss parts version also available)
Known Models	U-Boat Capsoil Darkmoon (Too many to list, add your watch in the comments below…)

The Ronda caliber 712 is a common 2 hand Swiss quartz movement. This caliber is part of Ronda’s normtech line of movements.

Some of the topics covered in this caliber listing:

Swiss Parts Vs Swiss Made:

According to the Ronda website, there are two versions of this movement: a Swiss parts version with 1 jewel and nickel plated finish, and a 5 jewel version with gold plated finish. You may see Swiss parts variations listed as being made by Harley Ronda.

Accuracy Rating:

According to the Ronda tech sheets, the expected accuracy is -10/+20 seconds per month in normal operating temperatures of 0-50 degrees Celsius.

Hacking Seconds:

This movement has hacking functionality, meaning that the second hand stops when the crown is pulled out to time setting position. Ronda officially calls this:

Stop-second with interruption of motor impulses.

Ronda claims that hacking the movement activates a power saving mechanism that reduces battery consumption by approximately 70%. If you are not going to wear your watch for long periods of time with a battery installed, it is recommended that you pull the crown out to save the battery and reduce unnecessary wear and tear on the movement. Keep in mind that even if you keep the watch hacked, the battery can go bad and begin to leak which may damage the watch.

Stem Removal:

To remove the stem on the caliber 712, make sure the crown is in position 1 (pressed in) and use your tool to press the stem release button located next to the small arrow on the movement.

Replacement Prices:

At the time of this post, replacement prices of around $16.95 were found online for the Swiss parts version.

Similar Calibers:

There are similar calibers to the 712 including the Ronda 713, 714, and 715. The 714 and 715 both have the date at 3:00. The 712 and 713 are essentially the same, but without the date. The 712 and 714 do not have a central seconds hand. All of these calibers use the same 371 cell battery.

There is also a longer life caliber 715Li that uses a larger CR 2016 battery cell.

Additional Resources: