Pfanstiehl Needle #700-D7 .7 nil diamond for use in P51-1 cartridge for 45rpm records. Not the same as Astatic 51 needles. These are common replacement cartridges used in the golden era jukeboxes. If your cartridge has been replaced with a light weight unit check to see if needle looks like its held in with a small screw, this might be the right needle.