A Helium relief valve is virtually never needed by anyone. It is a waste of money and another possible water ingress point. I was a Saturation diver back in the 1970's and 80's and did not even wear a watch, and especially not an expensive watch. I think the MM300 is a fine watch but could probably use some updates; sapphire crystal, larger signed double or triple lock crown and removable crown tube, better bracelet. I like the mono case.So, what are the collective thoughts here, regarding Jack's as to whether the monocoque case is arguably irrelevant? Would an He valve then be needed?
I'm curious about which watches with cases, are He safe and do not have He valves.