The shape of your crown leads me to think your crown may be original, or at least it's the right style. Early "waterproof" designs like yours likely relied on stem seals, gaskets, and some sort of case clamping force to provide a little bit of water resistance. Other designs featured rubber gaskets inside the crown with a "screw-down" action, or double-case designs where the crown was protected inside a second case cover.
Have you opened yours up yet, to see how it is put together?
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