Double / drilling newbie here. Over the years have had a handfull of shotguns ( primarily a handgun / .22 rifle collector ). All changed this week !!! Came home Monday with a Union Arms SxS, a beautiful Flues 20 ga., a JJ Weston, along with several pistols, Yeaterday I found 3 drillings and a double rifle, beautiful guns !! I drooled over them for 2 hours, took notes, went home and tried researching them. Found out little, but went back and bought them anyways. One is marked J.P. Sauer & Sohn, One Oswald Nerke Erfurt, other I havent looked at yet. The rifle is gorgeous !!! Marked G.L. Rasch / Gustav Kerstens, has a Jackenkroll scope mounted, in 9.3x74R caliber ( whatever that is ....). I will be up all night trying to hunt down what they are, values, etc.