I just found this for the princely sum of $3.59 including shipping, and is the copper nickel uncirculated version that was not known to exist prior. This is the uncirculated version that is similar to other Unc. Franklin Mint coins known (all mostly quite rare with the exception of the Jamaica 20, 25 and 50c coins that were in the PNC Franklin Mint issued Coins of [all] Nations - BTW most of the coins in these sets are NOT FM). Below that I have posted the proof copper nickel version of the same coin, but not the silver....
That should be 1984FM = Franklin Mint, the Royal Mint was also striking currency coins during this period.