Ten medals heavily forsted with mirrored fields, struck in .999 silver and perfectly preserved in two capitol plexiglass display holders. A superb group each coin/medal has a different motif and contains  .4726 troy ounces of pure silver and were struck to promote a silver backed common world currency. Needless to say the idea went nowhere. I would say these are rather rare now as the temptation to melt these coins for their metal value in 1980 would have been too great.  FDC