I think you will find that ear fabric is a lot more squishy than that of a watch, with significantly more sensitive nerves. If you had a watch that was last opened at sea level, even on a high barometric pressure day, and put it on the Moon, its internal pressure is likely to be little more than 15 PSI. Even a plastic Micky Mouse watch should stand that. Going the other way, that's like putting it under about 30 foot of fresh water. What depth is that watch supposed to be water resistent to, in meters?
Besides, the "O" rings and gaskets on a watch that old probably leak like sieve anyway.
