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
An interesting thing about the Big Date complication in this Ronda caliber 519 is that the date does not flip to 01 after day 31. It keeps going to 39, then flips to 00, then to 01. This will require you to set the date every month, and not just on 31 day months.
Replacement prices were found online from $11.95 to $16.95 USD.