what bottle is it? What did it contain? Argon, asethalene, nitrogen, oxygen, helium, calor gas?
I will have a mooch at work and find out what pressure we are talking here, I doubt someone will fill it if it has b.o.c (for exaple) plasterd over it. But who knows.
.atb. .ste.
I dont think you will have anything up to 300 or even 232 bar tho mate in all honesty, even then you will have a nightmare trying to find the right fittings (i would imagine).