Caliber 1020, mid 1970s to early 80s, this one needed a home a few years ago. Right time, right place. Mine now. This watch is all original (I have to be careful when I say that as some hawk-eyed viewer will call me on it if it's not). It had very little wear in the hands of its one previous owner. Bracelet in excellent shape, thanks be, as it would be difficult/impossible to replace!