Ooops, forgot to answer the first part of your post. The Franklin Mint secured beginning about 1969-70, contracts with various Central Banks around the world contracts for striking coins that mostly were NCLT (non-circulating legal tender)that in some cases were supported by currency issues actually released to circulation. Many of these were Caribbean countries such as Bahamas, Belize, Barbados, Cayman Islands, Trinidad & T., etc. and then Papua New Guinea, Malta, even Malaysia & Philippines.
Generally FM did a lead in with a proof set that had one or two silvers and was very high priced for the time, supported by mint/currency sets that had coins with prooflike strikes without precious metal after 1974.They also struck gold coins, again in proof and proof like as well as occasionally the "matte" presentation.These sets were marketed in the US through the Sunday paper, magazines, even TV and were touted for beauty, rarity and exclusivity (!?) even though some of the earlier sets were minted to the tune of tens of thousands.
The coins are quite attractive with appearance certainly more appealing than UK or US issues of the time, or even modern times with many birds, fish, etc. depicted....
Anyway, the FM basically killed the goose that layed the golden egg as there were exposes on such shows as 60 Minutes in the US exposing them as unequivocal ripoffs. In addition they "created", and still do even under new ownership other collectibles, including model cars and airplanes, crystal balls, silver spoons, etc. that also were marketed as exclusive and implied good investments - they were not. Many of these other collectibles as well as the coins plummeted in value.
But the final story is that quality of many of the pieces was quite high and so they in some cases became much better value after depreciation. The coins similarly were caught up in the cloud of near-scandal. The irony with them is that now some of the later 1980s bits sell on ebay for multiples of issue price, so a partial happy ending for the sets themselves...