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I recently obtained this Harper watch (see pic). It has a 17j A. Schild 1187 movement which had a broken mainspring and needed a good cleaning (lot's of oil, whew!). I cleaned it and after some mishaps--including losing a cap jewel which I was able to rectify thanks to the generosity of a fellow Watch Repair Talk(er)--was able to replace the mainspring and get the watch running. It's an inexpensive watch (I bought it for $3) but I was very heartened that I could get it running. Id's say it dates from the 50s - 60s? I have never encountered a watch with kind of back this one has. It has two pieces: a back plate and a screw ring (name?). Underneath the back plate was a gasket that had completely deteriorated over the decades. Now my challenge is to find a replacement. Not sure what it is I'm looking for. Does this kind of back have a special name and how would one specify the size of the gasket? From the size of the movement or the case? You'll have to click on the image to see all of it. Please excuse the clumsy image composition. Still learning how to use Gimp 2.