I bought a total mismatched Erfurt 1891 Gew. 88/05 many years ago as a shooter. I thought it most likely a Turk used rifle since the bolt head has Turk markings. The most interesting thing about it was the markings on the buttplate. Might these be unit, or some depot markings? Couldn't find any reference in the Imperial unit marking list I have. Totally irrelevant to the mismatched rifle perhaps, but just curious.