I am also looking for a replacement band. (It ripped.)

I checked into the replacement band a few years back. Found out from Relic that it would cost $25.00. I concluded that I was better off buying a new watch for $45. I'm now on my 4th brand new watch. I love this watch. Better off replacing than fixing.

Water resistance... 5 atm what is that.. is it really water resistant?

First off, don't take it diving; water resistant is not waterproof. Now for a direct answer: "atm" stands for atmosphere. An atmosphere=33 FSW (feet of seawater). So 5 atm = 165'. "ata" (atmospheres absolute) would include the atmosphere of air (14.7 psi) bearing down on that body of water, for a total of 6 ata. Information provided courtesy of a retired US Navy Saturation Diver. lol