Quote:
Originally Posted by jackjack
As mentioned above make sure the seller has a watchmaker who can properly seal the case. There is a small rubber casket and the case needs to be locked back on with a screw down tool to get it water tight. I’ve seen this done wrong where it slips and messes up the edges of the case back.
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The rubber caseback o ring should be lubricated with Fomblin grease as a lubricant to keep it from deforming and also to help with waterproofness. The caseback should be properly torqued to 5 Newton meters which is Rolex spec. The watch should additionally have a pressure test using the proper tester.