I'm going to leave it here as I don't want to be grouped in with the other chap, but a 300m rated watch can't be called a dive watch without the timing bezel. I get that and agree with it.
However, there is no such element for a free diving watch, apart from the depth rating.
According to Omegas own chart, the only difference between a watch rated for immersion and one rated for free diving is the depth rating. All I can't think here is that free divers regularly exceed 30/50m, so Omega specify a deeper rated watch for that activity.
What's crucial here though is that an Omega rated to 50m properly maintained, will be fine at that depth and you'll be fine with a warranty claim if it fails.
Hoteheels - you keep going on about misleading info/advertising on a big purchase but who/what is misleading?