I'm not a token expert but I have all of the Franklin Mint
sets that were offered from 1965, 1966, 1967, 1968 & 1969.
I believe the $5's were 1967. All of the 5's were sterling
and all of the 2's were silver clad. The sets were made in
both proof and proof-like. Your Riviera 5 does not look like
a part of these sets as I don't see a sterling mark.