RR Auction's Spring 2026 Remarkable Rarities sale, closing March 26th, is one of the most sweeping offerings in the company's 50-year history. The sale spans the full arc of civilization, from a 1510 King Henry VIII vellum warrant and a Queen Elizabeth I letter excusing the Archbishop of York from Parliament, to a Peter Stuyvesant land grant signed four months before he surrendered New Amsterdam to the English, and a William Penn indenture conveying 5,000 acres to one of Pennsylvania's original "First Purchasers." American history runs deep, with a dual-signed Jefferson and Madison appointment document, a JFK autograph letter sent to his Swedish mistress, and Lee Harvey Oswald's signed Marine Corps enlistment application. The science and classical music categories are exceptional, led by the only Mozart "Bäsle" letter available at public sale, alongside an Einstein ALS featuring hand-drawn experimental sketches, a signed Freud first edition of The Interpretation of Dreams, and letters by Marie Curie, Nikola T
