Waterproof/Datejust II

[333president]

Hey Guys,
I just got a Datejust II and I had a very, very reputable watchmaker install a really high quality 5 ct diamond bezel.

He said he pressure tested it for 45 min and it's good to go. When he said that, I was taken off guard. I thought the insides of these watch were sealed, even if the bezel came off. (I've only own'd a Sub - where you can snap the bezels on and off without waterproofing concerns).

Should I be concerned now with this thing still being waterproof? I don't really swim much deeper than 10/15 ft. But do you think it still has the water resistance of 100m? I have no idea what it means that he pressure tested it for 45 min.

Like I said, the guy is super reputable and he said I shouldn't have any problems. But, I wanted to see what the forum says! Thanks!