Stack's Bowers Galleries and Sotheby's are delighted to announce that they have entered into a multi-year agreement to jointly present a series of numismatic auctions at Sotheby's global headquarters in New York City. The first of these auctions will take place May 19-20, 2015, highlighted by Part I of the D. Brent Pogue Collection the most valuable collection of federal American coins in private hands followed the next day by an exclusive sale featuring numismatic rarities from various owners.