It is a octagon barrel with the mauser name and address on the rib, cal marked on the top of the barrel, serial (121,000 range) and proof marks stamped so they would be under the woodline. Dealer marked M. Widforss (they are located in Stockholm and still in business) on the barrel flat below the Mauser name. My gut tells me it is a take-off, but with Mauser there are lots of exceptions.