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Greek letters, of course. I'd never have guessed.
"Bitsa" sounds about right. It looks like FN used the Greek letter system on their Mausers. Any way to tell what year contract the bottom metal was...

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As promised, the photos. Note the various numbers and the symbol on the floorplate--I just can't figure it out.

Sorry if this isn't the right forum for this. I'm new, and this thing has at least a little Mauser in it, so...

I recently purchased the rifle in the title and am having trouble understanding...