I've seen it before - but why would the armory marking be peened on American-built M91s ?

I was at the local gun show today and the only M91 - as opposed to the slew of 91/30s - was a Remington Armory 1915 with the Remington Armory peened over. The eagle above it and the 1915 below it were untouched but someone definitely wanted to remove the ...
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