I just bought one. It is an interesting rifle. As soon as I can I'll post some pictures.

The barrel markings start with a large "N" on the first line, followed by "BLG" on the second, "SCH" on the third and "H" on the fourth. These are all capital letters but about half the size of the "N".
On the side is the marking 8.15x46R NORM. I think the BLG means Lead Bullets and the SCH is smokeless powder but I won't promise that is true. Other than that I am clueless.

The receiver is interesting as it appears to be a 1909 Argentine. No crest but on the side rail it has "Waffenfabrik Mauser - Oberndorf A/N" and a second line "Modello 1909."
The only marking on the top of the receiver ring is "MAUSER ORIGINAL" in all capital letters.

Bolt face and extractor are modified and it has a straight bolt.

No import stamp.

On the right rear side of the butt stock is an emblem, maybe brass, shape like a shield and about as big as a quarter with a target and under it the annotation "Meister 1937."

Any idea where to look to decrypt any of the barrel letters or what the badge is I'd appreciate.

Thanks and Merry Christmas all.