copied this from a web site and should help date the piece, which is probably a key fob:
When Chevrolet introduced its 1929 line in December 1928, it advertised "a Six in the price range of the Four." Which, in fact, it was. At $595, the top-selling coach -- as two-door sedans were called then -- cost only $10 more than 1928's four-cylinder Chevy in the same body type.