A fine 1784 entire from Thetford to Whitehall with Bishop Mark (3rd May) on reverse. Posted with free frank marked by the red cirlcle ‘FREE’ hand stamp alongside a straightline town stamp ‘THET/FORD’ (Willcocks NK417. Rarity ‘F’) – being used 10 years earlier than previously recorded. The letter is to Lord Orford. the Right Honourable Horace Walpole. son of William Walpole.