Soviet union 1980 Moscow Olympics 5 coin silver proof set 3x 10 Roubles and 2 5 Roubles the 10 Roubles weigh 33.5g each and the 5 Roubles weigh 16.5g each comes in case of issue with certificate and original receipt from 1979 cost £87 back then would be £400 to £500 in todays money