unused --, 1920, 5fr + 5fr Red, semi-postal overprint (B18), fresh, bright color, full o.g., lightly hinged, centered to T.L. with perfs. touching or slightly in (as often), almost fine for this very difficult and extremely rare stamp, signed Champion, Richter and Bloch, Scott retail $5,000.00, Yvert Ffr52,500 photo