It's all relative.
Some people like vintage gear of any type just because of the nostalgia related to it. They are known as "antique collectors". Some antique collectors like to actually use the stuff they acquire in order to experience what things were like "back then", or to relive their past, or because they believe things just aren't made like they used to be. Other antique collectors cringe, or call the "users" criminal, when they see them actually using the things which are becoming more and more difficult to find in the first place and should be "preserved".
Others only like to collect, or use, vintage gear of only one or two fields. We here are vintage DIVERS, not just collectors (as far as I know). But what does that mean. Well, it means different things to different people. As in most things in life, there are wide-set extremes, and the people from opposite ends need not be at odds with eachother. I'm sure there are vintage diving "extremists" out there who would look down their noses at a vintage diver whose 1962 DA isn't exactly "period" to the 7/73 original hydro on his steel 72. Some could even go so far as to thoroughly research the exact MONTH the DA was manufactured and find a tank with the matching month and year original hydro date.
Extremism has it's place. I used to have a WWll slat-grill Ford GPW jeep, and I remember that it was actually fun to try to make sure that every bolt on it had the Ford script "F" embossed on it's head. Ford vs. Willys. There were some differences. Is that a Ford glove-box door, or a Willys? I think they were interchangeable, and someone who just wanted the darned thing to go 4-wheeling in couldn't care less. But, to a collector, such things can be very important- even to the point of insanity.
My point is that everyone has their own ideas of how far they want to take their hobby. I personally HATE to see a chopped old car with a flame paint job. But, hey! Guess what! Even though those guys are out there depleting the supply of original body parts, they are probably to be thanked for helping to keep enough interest up in those old cars to keep vintage car parts suppliers in business!
Nemrod doesn't wear a vintage suit!? For shame, Nemrod!!! Do I wear a silicone mask? Tisk, tisk! But I love the double-hose. I love vintage diving; and, someday, when I have the vintage mask and vintage wetsuit, I'll love diving vintage (note how the reversal of terms here changes the meaning).
O.K. An H-valve is not vintage. Do what you want and have fun doing it. That is the name of the game!