According to the PST rep at DEMA last year they were made under contract late 70s to early 80s for Divequip and a couple other smallish gear distributors, including Sherwood.
Internal volume is the same as a standard 72, but the fill is 3000 with a + , or ~96 cubic feet @ 3300, or 116 cubic feet at a point halfway between working and hydrotest pressure. (0.02909cubic feet per psi, same as a 72.)
Note: When cleaning tanks it's possible to empty a standard 72 full of water directly into one of these and JUST fill it, so the internal volume is as close to the same as I've been able to measure it. Wall thickness is about .06 thicker though.
The PST rep did indicate they might bring back a similar tank in the near future. I hope so. Another dozen of those in my stable would be quite nice! I'm afraid I might even buy them new (GASP!!!) if they were ever offered again. Medum pressure suitable for "10%overfill" with good buoyancy, REAL metal and a double dipped Galv coating. What diver could ever ask for more in a tank?
FT
Shadow, if that bottle ever becomes an orphan I have a home for it!