500 000 Mark airmail 1923, corner margin top left, in perfect condition date-appropriate cancelled "Gdansk * 1h 24. 10. 23", certificate with photograph copy Gruber BPP (for the complete set) "perfect", Michel for normal stamp 450.- - as upper margin copy unlisted, in genuine used is these issue very rare, as upper margin copies places the several stamps small rarities and valuables the Gdansk philately dar!