information on the stamps' origin in the files of the Bureau of Engraving and Printing." 1868 1¢ Z-Grill In October 1998, Don Sundman and his son Zachary attended a Robert A. Siegel auction of the Robert Zoellner Collection and bought the extremely rare 1868 1¢ Z Grill (only two copies are known to exist). Zachary, then just 11 years old, held the winning paddle. The auction closed at $935,000, setting a record price paid for a US stamp at the time. Valued at $3 million, the stamp is the finest 1¢ Z Grill known and the only one available to collectors (the other is locked away in the New York Public Library's Miller Collection). Don Sundman later said of acquiring the rare stamp:"I could not believe my luck in buying the Z Grill in 1998 because other people had far more money than I did, but were not willing to pay it for the stamp. I'm so lucky. At the time, I used the analogy that the Z Grill to Mystic was what Michael Jordan was to Nike. The Z Grill could be our celebrity." 1918 Jenny Invert Plate-Number Block On November 2, 2005, Don Sundman traded the 1868 1¢ Z Grill with well-known bond fund manager and stamp collector Bill Gross for his 1918 Jenny Invert Plate-Number Block. The trade made national news with headlines like "Blockbuster Stamp Swap Worth Millions" (ABC News). Sundman later spoke about the trade and his feelings about both major stamp rarities:"I traded the 1¢ Z Grill for the Jenny Invert Plate-Number Block because it sounded like it would be fun. It was also the only way to guarantee Mystic would own the two best US stamp rarities.I loved buying, owning, and exhibiting the 1¢ Z Grill Mystic purchased in 1998... From time to time, collectors offered to buy the stamp. I rejected their offers... It was the only stamp Mystic owned that was not for sale. In the fall of 2005, the stamp press reported the news that the owner of the unique Jenny Plate-Number Block would auction the block in October. Mr. [Charles] Shreve offered me a unique proposition – if his client acquired the Jenny Plate-Number Block, would I trade the Z Grill for it? The Jenny Plate-Number Block is a fantastic rarity. I first saw it at the 1976 International Stamp Exposition in Philadelphia. Every collector and millions of non-collectors