During all this searching I did find out that the FM etched mark is definately Franklin Mint and definately not Fare Marcolin, so just to assure you Gareth ( Morgan48) , the piece that you saw sold as Fare Marcolin was in fact German made Franklin Mint.
There are a lot of pieces of glass that look a bit like very fancy Wine Bottle Coasters with ice like sides or lage Snow Crystals, that are so often sold as Fare Marcolin Konstglas because they have this etched FM logo.
It has become urban myth and therefor 'truth', but is in fact incorrect.