David -
I cannot help you with an original coin, but know of two reputable sources for reasonably-priced high-quality reproductions.
Three-Rivers Archery has some reasonably-priced brass medallions/coins that would work for a '66 Kodiak.
KurtBel5 has terrific copper & aluminum medallions/coins, but the '66 Kodiaks that I have seen all had brass coins.
Ray