These are sentimental and valuable things to own. Maybe take the watch off for the time it takes to shower?
Gaskets need replacing or at least should be checked every year or so if diving iirc. What about the temperature changes? Chemicals and oils and so on? How does that affect the gasket?
If you are gonna shower with it in hot steamy water expect to check those seals even sooner, expect the air inside the case to heat up. Expect your lubricants to degrade sooner, expect moist air to be sucked back into the case as it cools, stay in crevices under the rotating ring, expect rust to form, expect parts to wear, the spring to rust in the crown, pitting to develop under the caseback etc etc etc.
I mean, yes it was fine forty years ago, oh but which are the watches everyone wants? Yip, the ones that likely never saw ANY water. Let alone showering...
Knock a crown and you have compromised a seal. Gaskets flatten over time, why do you think they are so flat when you get your "new" vintage watch? You keep getting it wet and hot and dry or damp and that gasket will degrade and flatten sooner.
These were diver's watches with the word RESIST on the dial for a reason. Remember why it changed from Proof to RESIST? Because no watch is fully water proof. And no watch is air proof..... These seals expand and contact. They let in air and air can get out. Moist, or rather humid, air is what the seals protect my watches against.
Take it off. Look after the strap aswell as the watch.
Very thorough explanation, Guy. Thanks for your excellent insight.
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