I am looking to purchase functional Sherwood / Genesis 6300 valves, circa 1993-on, as illustrated above. The head is canted backwards, at an angle, and allows for various regulator orientations, which prevents one from get bopped on the back of the head -- especially, with one of my earlier Poseidon XStreams (4790-BK), which mounts on the very bottom of the first stage.
Yeah, nice design, Göteborg.
A recent accident damaged a 6300 valve beyond repair . . .