France, 1750, stampless cover / 2 page folded letter dated June 5, 1750, black "DHVNINGVE" straight line handstamp, manuscript "3" (= 3 decimes postage due) marking, and black seal.  Please see scans/photos for content, postal markings and exact condition.  Rare cover.  Free 1st class insured shipping to any U.S. address.