The collection of 650 coins was built up over 35 years by Texas property developer A. Mack Pogue and his son , D. Brent Pogue . It includes a coveted 1804 silver dollar worth $ 9.8million , which is known as the 'pinnacle ' of coin collecting . Each steel die used to strike coins in the early 1800s was painstakingly produced by hand , creating variations that are prized by collectors . This particular one has been on display at the Smithsonian for more than 30 years now - it's called the " Jefferson Dollar " because it features an image of Thomas Jefferson with his signature on the
The collection of 650 coins was built up over 35 years by Texas property developer A. Mack Pogue and his son , D. Brent Pogue . It includes a coveted 1804 silver dollar worth $ 9.8million , which is known as the 'pinnacle ' of coin collecting . Each steel die used to strike coins in the early 1800s was painstakingly produced by hand , creating variations that are prized by collectors . It will be sold in a series of seven auctions in New York and London , beginning on 19 May and culminating in a final sale in May 2017 .