I just picked up a new Citizen BN0000-04h at a watch shop for $220, same as on Amazon, and I was completely sold on this watch upon its design specs!!! I have questions: experts please! I found that it's ISO rated, which is promising that it's a true diver as my Seiko SKX, but with 100m more depth rating, 300m! This is Seiko Marine Master territory now, >$2000! The reason I specifically claim this is the Citizen is engineered with a monobloc stainless case. Is it helium impermeable as the Marine Masters with monobloc cases, no helium escape valve? Also, is this watch rated/engineered for saturation diving? If so this watch is the absolute best bang for the buck in engineering and watch history without a doubt! Seiko SKX price with Marine Master engineering and specs!!!