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An A in marker means nothing except someone wrote an A in marker on it.Oops my mistake it’s full of air how can I tell if it’s the bad alloy and there is an A marked on top of the valve itself in a black marker. There is a boot on the bottom of the tank I’ll check and see if there is any more information located there. I appreciate you taking the time to answer my question.
If you can get the boot off and it's a steel, check for rust. I doubt there will be any markings under it to make that worth a lot of effort.
Thump it lightly with a wrench. Steels "ping", Al's have more of a flat sound - realize though that this is about as UN-scientific of a test as there is unless you have both next to each other.
Read the linked post, it breaks down how to tell pretty clearly. Obviously if the other poster is right and it's a steel, it's a non-issue. My buddy dives old steels from the 70's and they work just fine.