What can anyone tell me about the value of the Russian model 1891 with the 51 inch length? Not 91/30

I am interested in the value and the last date the Mosin Nagant model 1891 (not 91/30).

value on a md 91 providing it's a non import stamped matching serial number rifle would be between 250-350 for the common versions ,,if a remington or a westinghouse then those figures would possibly double ..again depending if it's correct and matching..the 91/30 came out in 1930 and alot of 91's were converted to the 91/30 configuration,,the main difference was sites and the elimination of the 91 hex receiver
bigcurt