I don't recall any multi-player rookie cards from the 1950's and I've exhausted my mental data base on cards from the 1960's, so I give up. It must be from a later year, which I don't care much about. Or else I had a brain fart on the 1960's.
#1 in 1959 Topps. Officially known as Assassin according to stanthemanfan 3/31/2014 and god of minor league basketball according to cammb.