I could use some help in identifying a set of twin tanks. I worked in the business for almost 49 years... never came across tanks like this.
They are 3 / 4 " straight thread, 1800 psi, galvanized and concave bottoms, the manifold appears to be a Voit, only date that I san see is a 7-72.
These are NOT converted co2 bottles. The serial #'s are prefaced with " HC ". any help identifying would be appreciated.
U.S.Divers had cylinders in the 60"s, that were 1800 psi and were listed at 52.8 "
I did a visual... the interiors are near spotless, also a tone test... beautiful sound [ like Quasimodo ringing the bells at Notre Dame ]