I don't know the name of the kit; don't have a catalogue. Late 70's. It's missing a floor tom. Maybe its half of a double bass drum set (and the half that didn't get the floor tom?) Get a close up picture before you buy; black chrome can get badly damaged (pitting, scratches, rusty) so condition is important to value.

The mainpage has a bunch of Slingerland catalogs. I have never seen a slingy kit like this but im sure they were made.. "The Dr" should know.