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I’ll start, with a 5517...

Thank you Jackflash and Hologramet. I have a Vietnam midcase that came with no crown so I indeed use an Athaya 702 and have to admit it has not had a water intrusion problem. However, I recently received a genuine sub crown that came with a 1520 movement and what I noticed is the inside gasket was massive and heavy duty looking. I think the crown is a 704 or maybe a 703. It just looks so much better and heavier duty looking. But I understand the period correctness for 5517 you are talking about. I guess I was kind of high jacking the thread to understand the construction of the Ruby case crown but I think it's helpful to know for this build here as well the information about either crown. It sounds like the crown that comes with a Vietnam case is clunky and not good anyways so it sounds like a good idea to always use Athaya or a gen on it for any build. So thank you, this has been helpful and I think helpful for this cool 5517 project here.

Athaya 702

1) 702 is period correct 2) Rubys crown looks like a fat 703, is marked like a 702. Everything is just wrong. 702 is also Triplock. I highly doubt the seals between crown/tube will limit your WR.