It was an old American Indian symbol. Many companies used it as their logo before the Nazi's adopted the reverse image and then everyone distanced themselves from anything that resembled it. Likely in this case it is the logo of the company that inspected and filled the bottle on that date. Your hydrogen bottle was no doubt inspected and filled by the same company.
Quote:
Originally Posted by Yoyodyne
Do you know what the reverse swastika means? I had a hydrogen tank with one of them on it, and a 1912 date, wondered what it's history was.
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