Gas Cylinder Marking

[cwbuff]

This is a narrow sight base gas cylinder that is marked with a "C" on the top flat. What does it mean?
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[Orlando]

You will see different letters or numbers stamped on SA WWII gas cylinders. Meanings unknown

[Bob Seijas]

AFAIK, the only one anybody has identified is the V indicating a new finish process, but I forget what it stood for IIRC it started with V.