M1A1 Stock Mark?? Early S/N !

[Jim Nasium]

With much respect and thanks to Garandrew's posting about M1A1's, I've a question on a mark on one I once owned.... Early one..... 143XX. Bbl mkd 12-42.
The mark is shown below circled in grey.

Anyone know the meaning of this??

Ronnie, aka Jim

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