Unknown (to me) carbine magazine

[Curt]

Or perhaps they were trying to get a contract to make carbine mags and this was a testing example?

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[dnikkor]

Or perhaps they were trying to get a contract to make carbine mags and this was a testing example?

That's the $5,000 question.

[phil441]

There is an old-line manufacturing company called Stanley Electric U.S.CO.
They were (or are?) a lighting component company but at one time were involved with other things as well.
Just a thought.

[imarangemaster]

That would make sense, as a lighting manufacturer would already be doing sheet metal and stamping. Someone should see if the are still in business. Most companies have an archivist or historian. worth a shot. That may be a $5,000 one-of mag!