The three collectibles — a stamp from a former British colony, a 1933 “Double Eagle” coin and a sheet of US postage stamps printed with a unique error — may all set new auction records within minutes of one another, according to Sotheby’s, which is organizing the sale.
The oldest of the items is a 165-year-old One-Cent Magenta, described by the auction house as the world’s “most famous and…