Two today, actually. My 60 year old Tissot PR516 self winder with date, on a stainless steel Tissot sport bracelet which is a witch to fasten. And my 135 year old Stewart Dawson, Liverpool, sterling silver key winder on its 66 gram (more than two Troy ounces) sterling silver Waldemar chain. Got the Dawson with the chain for free, but as usual, quite a bit of “sweat equity” invested in it, over three sessions on my bench to bring it to where you see it. This is the best running 19th century English pocket watch I have ever seen.
DeVille 111.0139 from 1978. Not the golden age of mechanical watchmaking, but at least it's not quartz. Manual wind caliber 625 is small but fights above its weight class. I like it so much better on a Milanese bracelet than a leather strap.