I believe its only rare to the people that collect Mosins, Most likely that rifle was sporterized in the 60s or 70s because it was bought for 19.99 to 35.00. When I was a kid my grandfather would take me to Old Town Alexandria to Hunters Haven and that store had Barrels everywhere full of surplus rifles for sale for almost nothing. You could walk down the waterfront and peek in Interarms warehouses at the import guns and ammo were stacked 20' tall.They were everywhere for sale Roses, Kmart, local hardware stores, NRA, And gun shows.
Its not like its Audie Murphy's M1 Garand, To most of the world its just a old Mosin.
I think they were the same as or shared the building with Interams in the late 70's early 80's. I was a kid in a candy store! Took my entire lunch hour to get there and back and be a bit late BUT it was worth the ass chewings.