I believe that I have seen years ago a Dacor double hose with a HP port (I think it was a "Clipper" version). I have also heard of people taking the HP body and drilling it, taping it for threads and making their own HP port. But again, that was some time ago. When I get home, I'll look at my older Dacor catelogs, as I think I have the some one as the one pictured. That really isn't to "vintage" for Dacor, as the Olympic line was their line at the time and the R-4 was their double hose. This one with the balanced first stage may have had a HP port too, I'll check on that this evening. The Dacor Dart regulator is the really vintage Dacor single hose, and I had one, then sold it, and now have another. It had the only double-lever system that I know of in any single hose regulator second stage. The Dial-a-Breath double hose regulator is one I had in the 1970s, and dove a bit. I then bought the internal parts for the R-4, and changed out the regulator to convert it from the former to the latter. That R-4 I dove for years, and had a lever modification that I made that I thought would help the regulator. I gave it to the Dacor rep when he came through the Roseburg, Oregon area one year, and never saw it again. Several years later, when I brought it up, Dacor sent me a Pacer regulator to replace the converted R-4. I regretted giving it up, and the Pacer I received was possibly a pre-production model with drilled (round) holes for the second stage exhaust (not the stamped out ones on the Pacers I have now). But Dacor was a very interesting company, with great products which were very servicable. Their first regulators, and all of their double hose regulators, could be maintained with a screwdriver, pliers, and little more.
Here is a photo of me using the R-4 in about 1973.
Luis, if you have the Dacor CVS, do put it in the water and dive it if you can. It is an interesting experience. Once you add air, you really do not need to mess with it again, as it does maintain a constant volume. But you need to read the book on it, and get used to it too. It operates differently from other BCs.
Using the Nautilus with a Sportsways Hydro-Twin regulator in 2007. The Hydro-Twin has both a LP and an HP outlet, hence its use with the Nautilus CVS. This Sportsways regulator also features a balanced first stage and downstream second stage (it's predicessor, the Duel-Air was an upstream tilt valve off an unbalanced first stage).
John