Have a 16 ga sxs that has aug schuler suhl,on bottom of barrels in front of the battel flats, question is all the proof marks are french St. Etienne proof house, except for 2 flying ducks on the barrel flats , I assumme that is for double proof since it has french double proof marks and and double proof in french. Did schuler make these barrels for a guild maker or what gives, no other makers id marks.