Pinned base magazine marking

[Mikecp@2022]

Have you seen such marking on a pinned base full blue magazine, no other marks on top of the heel such as L, R, S, or G.
That could be a prewar Colt magazine?
Thank you.

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[Mikecp@2022]

Received an answer, that marking comes from a Ballester-Molina 1911 magazine.