Sessions Catalin Clock
This clock was made by Sessions, circa 1940.  It was originally part of a trophy, but this clock was also sold as a stand-alone unit.  The case is made of a pea-green shade of Catalin plastic, with white marbleization, and is about 4 inches in diameter.  I have also seen this clock with a brown Catalin case, and the same case design was also used by other manufacturers.