Got my great gma’s watch fixed, needed a new winder cap (forgot what they called it) and was lucky enough he had one era correct one left. It’s circa 1920 to 1930 and for a hundred year old lady, she’s doing great. Could not figure out why it kept stopping. It’s an early “self winding” that uses movement to keep going. Since it’s old, I have to move my hand around a lot. But worth it to use my family heirloom and happy it doesn’t need a repair.