George VI, 1937, Coronation Proof Silver Threepence, NGC PF66. All items guaranteed genuine. Welcome to Holding History Inc! We specialize in ancient and medieval coins, as well as obsolete US coins. We have been professional dealers for years, and offer a wide range of inventory and friendly customer service. This is for altered items. If you clean a coin, or alter an item in any way, we are no longer able to take a return on the item. We will respond as quickly as possible to any inquiries. Listing and template services provided by inkFrog.