Tom Slater, Heritage's director of Americana, says while items related to the nation's first president aren't rare, it is unusual to have pieces up for auction that have been kept in the family for so long. The family is also offering a compass expected to sell for more than $40,000. A Gunter's Scale, a 24-inch wooden ruler that was a precursor to the slide rule, is expected to sell for more than $30,000.