U.S. and Worldwide Stamps and Postal History

1864 15sld yellow brown, three singles, minor perf. flaws, canceled by two clear strikes of "Constantinopel 26/11" on 1864 cover to Scotland, with "F.14" and P.D. handstamps, London transit and Stranraer arrival pmk on back, minor backflap flaws, otherwise fine and clear cover from Austrian Levant, with Lombardy franking, routed via Austria, Prussia and Great Britain, with "F14" indicating credit due to Prussia and Great Britain, signed Sismondo, with his 2015 certificate ("possibly the earliest known date for "F14" marking")
Estimate: $500