Rolex

This is a repost of mine that may help This question has me stumped as I thought the "Triplock" always had an O-ring on the exposed part of the stem where this Triplock as the gasket on the inside. Again I may be simply wrong in my reading of the Triplock...  

Now we've got 2 threads going! This is exactly what the one I've been offered looks like, thick but no O ring! Thanks again Bill, Peter

Sorry about the double thread on the Triplock. Hopefully you will get twice the response. But I think you may already have what you need. Bill

Thank you for the insight. Invaluable advice and pics. The one I've been offered looks identical to the one you've shown. Peter

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...in the early 1970's did not have the external o-ring. Cheers Jeff

Is it possible to say what year the triplock replaced the twinlock? And when the 7030 triplock with external O-ring replaced the 7020 without? Thanks for any additional information. Andrew

before 1971: twinlock 1971: triplock without external o-ring 1980: triplock with external o-ring (photos; DiverDick) ...  

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Really helps having a wealth of knowledge on here. Regards, Peter

The O ring on my 16800 sort of tore at one part and I had it replaced at RSC (they replace the crown with the ring). However, I noticed again that there is a small tear on the new O-ring. Should I be concerned and get ti fixed again or just leave it. And ...