<text>  A rare five-dollar gold piece . and a prized silver dollar each could fetch 10 million or more . in upcoming auctions, making the American rare coin market as . attractive, though not nearly as glamorous, as fine art. Sales of rare U.S. coins reached a record of nearly 536 . million last year, and now collectors are turning to the D. Brent Pogue Collection, which could boost it higher. Gathered over more than 30 years by Texas property developer . A. Mack Pogue and his son, D. Brent, it is considered the most . valuable collection of federal American coins dating from the . 1790s to the late 1830s in private hands. Scroll down for video . Above, a rare 1822 Half Eagle five-dollar gold piece, one of only three known to exist. The rare five-dollar gold piece and a prized silver dollar each could fetch 10 million or more in upcoming auctions . An 1822 Half Eagle five-dollar gold piece, one of only three . known to exist, and an 1804 Silver Dollar dubbed the King of . American Coins are expected to be among the top lots when the . collection is sold in a series of auctions in New York beginning . in May and continuing into 2017. These two coins in particular, we think, have a possibility . of being up around that 10 million mark, Brian Kendrella, the . president of Stacks Bowers Galleries, told Reuters. The rare coin and currency auctioneer, which is handling the . sales with Sothebys, believes the coins could shatter the 10 . million record set in 2013 for a 1794 Silver Dollar. Although jaw-dropping prices for contemporary art grabbed . headlines in 2014, rare coins also had a banner year and are . among the biggest collectibles behind art and antiques. A 200-year-old Silver Dollar dubbed theKing of American Coins, is seen in an undated handout photo courtesy of PCGS . Coin sales are driven by the economy, but Kendrella said . investors and collectors are also lured by the rarity, . uniqueness, condition and historical links of coins. They are artifacts that speak to what was going on in the . United States at the time these coins were made, he said. Thats one of the main draws. With a dozen coins selling for 1 million or more in 2014 . and the first gold coin struck for the United States fetching . 4.5 million, the nonprofit Professional Numismatists Guild . estimates the overall U.S. rare coin market to be worth about 5 . billion. Walter Husak, a retired aerospace entrepreneur based in . California, knows just how lucrative it can be. A collection of . 301 rare penny coins dating from 1793 to 1814 that he gathered . over more than 13 years sold in 2008 for 10.7 million, about . double what he invested in it. I never thought it would go up that much, he said. There . are a lot of people getting involved in coins. Barry Stuppler, secretary of the Professional Numismatists . Guild, has seen plenty of changes in his 52 years in the coin . business, with buyers increasing in recent years. It is a combination of the economy coming back, he said of . the market, and the fact that interest rates are very low. The Internet also has been a tremendous, tremendous source . of new buyers and sellers of coins that we didnt have 20 years . ago, said Stuppler. Demand for rare, investment-quality coins, graded and . certified by the guild and the Florida-based Numismatic Guaranty . Corporation, is high and supply is low. The rarities do the best, particularly gold and silver . coins, said Stuppler. The Pogue Collection is extraordinary. 