Hi John, it most likely is an armours replacement barrel, I've seen them (Mauser E/135), like the one you have, or (also, I think, 42 replacement part code??) and also, Styer (E/623??) accepted replacement barrels... usually new and in brown wax paper... They are often offered for $200.00, and some sell, some don't.. just it depends on the economy ??

... I've paid between $100.00 to $165.00 for them... If you want to sell or trade for something, let me know... Best to you, til...lat'r...GT