You spent the equivalent of $1650 in today’s dollars for that Rolex in 1965. They were selling for a lot more than your purchase price in the civilian world. Figure on getting half of it’s current retail value if you ever decide to sell it. That’s still a sweet return on your investment. Rolex watches are expensive to get serviced and aren’t really known for their performance. I believe they’re sealed with dry nitrogen so opening the case to adjust the regulator exposes the movement to the elements.