This is a one-of-a-kind crew gift clapperboard from Teenage Mutant Ninja Turtles II: The Secret of the Ooze (1991). Normally clappers would display the names of the director and the cinematographer, but this clapboard shows the prop master of the movie, Richard “Petie” Waldrop, because it was presented to him by director Michael Pressman after filming wrapped on December 4, 1990.
There are hidden magnets on the wooden arm to prevent bouncing after clapping. Similar style slates can be seen in The Making of Teenage Mutant Ninja Turtles Behind the Shells (1991) documentary.
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