NP sub F is for Ferlach. The intertwined "EF" is the stamp of the preliminary for Ferlach. Beside the "5160" of the data string looks to be an "Eagle" "Crown" over "S" stamp suggesting German tubes? There also looks to be a mark between the right flat and the "16.1" stamp? I'd guess a 1925 year model(final proof in 1926) and the barrel maker/mechanic initials(K.W.??) look to be beside the "1200.0" on the left tube. And there looks to be the letter "K" on the right tube toward the forend lug?
Kind Regards,
Raimey
rse
