Of further interest to non-sport collectors is the connection, if any, between Nu Card and Rosan, which issued a couple of monster sets a year or two after Nu Card vanished. Rosan was based in Brooklyn, about a one hour drive West of Bellmore or Seaford. There was a set of monster cards (known in the non-sport hobby as the "Blue bordered" set") which was a crudely pirated copy of the orange-bordered Nu Card set. The back of the card has the Nu Card name and location crudely crossed out in black ink.
My personal theory is that one or more of the principals of the Nu Card company set up Rosan as a successor company, issuing several sets quickly during the 1963/1964 timespan. The sets were done on the cheap, were not issued in wax packs (vending machines only), and Rosan disappeared shortly thereafter. I've pointed out that the backs of the Rosan purple-bordered Terror Monsters set actually carries the company's phone number. I've never thought to call the number, to see who would pick up.
I guess it was easier to operate on a shoestring, back in the day.