2019 Double Dragon 1oz Silver Bullion Mint Sealed Roll 20 Coins. You will receive a sealed roll of 20x coins. Single coin close up is for reference. The item "2019 Perth Mint Double Dragon Silver Bullion Mint Sealed Roll 20x 1oz Coins" is in sale since Tuesday, June 18, 2019.This item is in the category "Coins\Bullion\Silver\Coins & Rounds". The seller is "adroit6900" and is located in Brighton, Victoria. This item can be shipped worldwide.