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This is another one of my Grandfather’s watches. It had stopped running years ago. I decided to take the back off and have a look. First thing I noticed was a rusty crown shaft and one of the screws that holds the movement was rusty also. I removed the crown and the watch from the case. When I removed the crown it started running. I removed the rust from the crown and screw and reinstalled the crown with some lubrication. It has been running and keeping pretty good time for 3 days now. Help Request: I would like to ask for some help and guidance for finding the proper crystal for this watch. I have searched and searched but I can not match any of the numbers I have to anything I have found online. This really has me stumped. Here is the information I have with a few pictures also. Omega Seamaster Calendar Calibre: 502 Movement Serial Number: 17073574 Numbers inside case: KX6275 E76553 If anyone could steer me in the right direction to locate the proper crystal I would appreciate it.