vintage 1952 1953 copper brass bakelite frigidaire trapshoot diaa trophy first

This is a trophy from the Frigidaire diaa trapshoot team. 1952-1953
First high gun
Ray lesher
307 x 350
It needs cleaned but I'm unsure of how to properly do that. The top is either brass or copper. The bottom looks to be celluloid or Bakelite. Not sure. A neat item especially to whomever can clean it all up. Or maybe knows of a Ray Lesher ;)
Please ask any questions.