I've always wondered about this, and while I thought there might be a way to seal the rear crystal in more permanently but I never thought about refinishing the case back and I guess you would need to remove the "glass". Besides, you do have two completely different materials pressed together so you would need a gasket since they would react differently during pressure and temperature changes. I've noticed the latest crystal seals on dive watches seem to be of the "L" shaped delrin variety and really tough, but are no good once disturbed. Another thing for the watchmaker to deal with during a full overhaul, but very reliable once properly installed. Thanks Archer-
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