I have acquired an unusual scuba cylinder. I can use a little help in finding information about it.
Here are the markings:
on one side
NO.1243F
NON-MAGNETIC
3000PSIG (SPUN)
RE91
one the other side
TEST 5000PSIG
9-65
EE 61.4.CC
PE .0-CC
VOLUME 700 CU IN
The cylinder appears to be aluminum, it has a round bottom. It is 7 1/2"x26".
It has roughly the same internal volume as a steel 72. The expansion at hydro was 66cc.
It has a 3/4"neck...standard scuba.
The good news is that it passed hydro, the bad news is that I can't stamp it (no ICC or DOT)