10 Silbergroschen rose-red, for internal postal accounting, horizontal strip of three on piece, three perfect single-circle "HAMBURG I.A. 13/6 68 6-7N" strikes from the NDP period, complete roulette on all sides and 4 mm sheet margin at bottom, blue company handstamp additionally on both upper stamps, sound quality without reservations, unsigned, photo certificate Maria Brettl AIEP (2017) "Perfect and attractive overall condition of these difficult stamps", Mi. 600.-, ex Countess Roseneck collection