Swedish Mauser barrel
I got the barrel out and looked it over. I was wrong about the cosmoline, that is on another barrel. It is 23 5/8" long, in the white, and covered with some sort of cream colored material that appears to have been applied as a preservative, but has dried up. I didn't swab the barrel out, but the outside is pristine. It is wrapped in a newspaper dated Dec. 14,1992. Don't recall where I got the barrel. It looks like a military issue part. Numrich has one listed in very good condition for $53+, but out of stock, as are most of their 6.5x55mm barrels. The only marking I found on it is CO on the large diameter, just behind where the rear sight mounts. There is a double dot (Umlaut?) over the O. It has all the steps and angles to be a short rifle barrel as use on the later models.