Floyd Risvold was a curious 6-year-old when he found a dusty stamp collection in his grandfather's attic.
That collection became the seed of a passion that grew into a one-of-a-kind collection of historic letters, stamps, maps, documents, photos and books that Risvold studied in the libraries of his Edina home.
Risvold was 97 when he died last year. On Wednesday, the collection he lovingly built over the decades will be auctioned in New York. Experts are drooling over the array of items expected to sell for about $5 million.
"This will be one of the top auctions of the year," said Cheryl Ganz, curator of the Smithsonian National Postal Museum in Washington, D.C. "You're just talking about one rarity after another. ... It just takes your breath away."
Risvold is a legend among philatelists, who collect stamps, postmarks and stamped envelopes, said Charles Shreve, president of Spink Shreves Galleries, which will run the three-day auction.
"He was passionate about history," Shreve said. "He wrapped postal history together with autographed documents and letters to tell a story, the story of the movement west from the Mississippi River in America."
The auction has 1,298 lots, some containing multiple items. They include relics linked to the Pony Express, Indians and Mormons, documents signed by Abraham Lincoln, Thomas Jefferson and John Adams, and items tied to the Minnesota Territory.
A historic treasure trove