I showed my 60 year old Tissot PR 516 a day or two ago. It wasn’t until I saw it enlarged that I saw there were there were some “floaters” behind the crystal. So I attended to that, today, and polished the crystal. Looks better, I think. I hadn’t worn this watch for a long time, and I’d forgotten how remarkable a performer that it is. The Tissot bracelet is dammed uncomfortable, however. It pinched my wrist yesterday when I put the watch on! But it is right for the watch.