First of all, thank you for your replies. Krinko, I agree with you about the fonts (and size) of my bolt, but I would exclude a renumber job: to do that (as for K98icon's bolt root), it is necessary to ground off a considerable amount of steel from the bolt flat side; if you compare the two bolts, you'll notice in both the presence of the army acceptance stamp (the horizontal <). It would lead to assume that this acceptance stamp was applied after the carving of the s/n. Furthermore, the firing proof stamp (crossed flags) has the left corner slightly over the flat side, so, again, it should be applied after the bolt was serialized or, at least, after the flat side was made.

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The numbers and the block letter "M" are also different on the fore end, and again there's not any sign of grounded wood (compare with the inspector's stamp below).

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By that, just in my opinion, I think the bolt was numbered in a different time and/or place, as was for the stock: the 1940's production was under the Luftwaffe's bombing campaign peak, so I think the "dispersal" program at this time was at its best...
About the story of this rifle, she comes from a bunch (more than10.000 pieces) of SMLE's, N°4's and even Long Lee's supplied by UKicon to Italianicon Navy in the 50's, as military aid.
Some were used in military training, while the vast majority was left in wooden boxes, still covered in cosmolene. This is a pic of me, when I was a young Navy officer, during an honour ceremony (1993). My platoon was equipped with N°1 MkIII's and M1907 bayonets.

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Excuse my poor English, I studied Frenchicon!