This is an authentic, original 1973 Official Mint Set of the Soviet Union (USSR), struck at the historic Leningrad Mint. This highly sought-after collection features a remarkably low production limit of only 10,000 sets worldwide. Please note that this listing is completely upfront about its completeness: it includes the full array of nine uncirculated legal tender denominations and the official Goznak mint token safely sealed in their original factory plastic blister pack, alongside the original bilingual paper specification sheet. The outer cardboard wallet enclosure is missing from this set. This specific year is highly coveted by world coin numismatists because it contains the scarce 1973 1 Ruble and 1973 50 Kopeks key-date coins, which are incredibly difficult to find with this level of surface preservation. The clear cellophane packaging has aged exceptionally well, maintaining excellent clarity with virtually none of the cloudy chemical haze often found on vintage Soviet plastics.