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Czechoslovakia, Socialist Republic (1960-1990), Silver Proof Set 1968 (2) "Ducats of Prague", Kremnitz mint. Medal of 10 Ducats "President Dubcek" Ag 40 mm 25,00 g, in Slab NGC PF67 Ultra Cameo (cert. 6643224006 second best grade), Medal of 5 Ducats "Alexander Dubcek" Ag 30 mm 13,00 g, in Slab NGC PF68 Ultra Cameo TOP POP (cert. 6643224007), with original box and certificate