I say "interesting" for a couple of reasons: The autograph is actually dated 1971, which is, of course, thirteen years before Robert Hooks portrayed Admiral Morrow in The Search For Spock. He added "NYPD" to his signature, because (I assume) "Frank", to whom he addressed the autograph, must have been a fan of that show. NYPD ran for two seasons, from 1967-1969 -- the same years as the last two seasons of Star Trek. Robert Hooks played Detective Jeff Ward, one of the three main characters, and was (according to Wikipedia) "the first African American lead on a television drama" (Nichelle Nichols beat him to science fiction!).
- Read the Wikipedia article on Robert Hooks
- View the Wickipedia article on NYPD
- The IMDb page for NYPD has less information, but there's a good review by someone who watched the show as a kid.