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Homer, reference List of changes...31st may 1926.... Cases to be stamped '.22 ' on left side, to enable ready identification of the magazine case.
If my memory serves me correctly these were to be...

That is one tattoo'd old lady. The .22 stamp is on the wrong side of the mag. but that's life.
She certainly is a parts bitzer, but I have one unmarked thats also like that. No tattoo's though.