find description of a DR for sale in the US in 2012 http://oldguns.net/q&a11_12.htm "I have found an interesting antique gun for sale in the western hills in Maine. It Is listed for sale as W. Collaath Under lever gun in 18 ga??? , Boxlock, bone horned trigger gusard,26" double bbls sxs, serial # 8544. Markings are listed as KMG Crown Figure with the letter N under it. Markings under barrels are 10/6 mm60, nicely engraved with whitetail buck under ferns. Frankfurt a.o. "
so SN 8544 is a DR for the 10,6x60R one of the different cartridges made by using 11,15x60R brass not sure about the engraved white tail