That is a Hydro-Speed blade set-up for a Bolens tubeframe. They were made by Hydro-Speed Equipment, Los Angeles with a branch in Hammond, IN. It was designed to mount in 3 ways: center, front, or rear. The correct pieces appear to all be there. I have one of those for my tubeframes. As for price, well, you don't see them complete very often. The holes in the blade were for mounting a rod with scarifiers on it; the scarifiers and available end plates were extra cost items, so not all of the blades have them.