The World’s Greatest Conquerors Official Sterling Silver Coins Collection Set (OOAK). Set includes 24 Sterling Silver Coins. Product Specifications for each coin:. Year of Issue – 1997. Weight – 31 Grams. Diameter – 38.61 mm. The item “The World’s Greatest Conquerors Official Sterling Silver Coins Collection(OOAK)” is in sale since Friday, June 29, 2018. This item is in the category “Coins & Paper Money\Coins\ World\Collections, Lots”. The seller is “gatewestcoins” and is located in Winnipeg, Manitoba. This item can be shipped to Canada, United States.