Power saving mechanism with pulled out stem: Reduction of consumption approximately 70%
Interchangeability: All versions 11½”’ with same movement height 3.00 mm and stem height 1.50 mm
Very powerful stepping motor
Swiss Made vs Swiss Parts
There are several caliber 515 based quartz movements by Ronda. There are Swiss Made and Swiss Parts versions available. Both are nickel plated metal, both have 1 jewel. Ronda documentation claims an accuracy of -10/+20 seconds per month.
Caliber Number Location
Ronda does not stamp the metal part of this movement with the caliber number, instead, you can find a reference on the outer plastic part of the movement. It is not the full caliber number (515.24H) but the base caliber.
How to change the battery
There is a metal locking mechanism for the battery that just uses tension to hold it into place. Gently put your tweezers or other tool in the hole and slide it over – not too hard and not too far. The battery will pop out like in this video. Do not remove the screw.
To remove the crown/stem, find the hole with the arrow. While the crown is in position 0, pressing this with your tweezers or other tool will allow the stem be unlocked so you can pull it out.