According to [block]4[/block], this caliber features:
Repairable metal watch movement
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
There are several caliber 515 based quartz movements by Ronda, for example the caliber 515.24H. 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.