Thanks CRA. Where did you get that info from?
Navigator NCC-2120 USS Entente
From Star Trek Memories, written by Mr. Shatner. He also mentioned it in Up Till Now and in numerous convention appearances and numerous taped interviews. He appreciates Mr. Nimoy's support and friendship so much that he considers "Devil in the Dark" his most favorite TOS episode.
I did a little math and figured out he made quite a handsome amount of money from this project. Over a million dollars I believe. Not bad for a movie made for half a million dollars. He is rather delightful in this movie.