This is a Scuba Diving Tank -OR- an air supply tank for a B17 Gunner's Ball Turret.
I think that these started out as gunner's air supply tanks, and were repurposed later for scuba diving. Maybe. I have seen pics online of both applications.
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However, this tanks is vintage millitaria, and is quite rare. None other is available anywhere that I can find.
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I tested it with compressed air and it holds air fine with NO leaks.  The threads at each end are good. One end fitting had the numbers T619239 on it.
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The tank has a small dent in it. See pic.
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Unfortunately there was writing on one end that is now gone because of the flaking yellow paint. The tank itself is Aluminum.
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Check out the pics!
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