I inherited this watch. They worked until the crown was lost. I don’t know if the mechanism is original, the silver watch has two covers on the back, a glass on the front and markings: crescent and crown, number 190734, two letters RF in the upper part of the cover and of course the hallmark of silver 84 and under these numbers 0.875 and another mark above the hallmark in the form of a lion. There are two letters R A on the movement itself. There is no manufacturer's name on the dial. watch weight including mechanism 25 grams.