6 Kr. blue, IV. issue, horizontal pair and two single pieces being a properly franked 24 Kreuzer franking on international letter in the II. weight step, with Dreringstempel "220" together with single circle postmark "Frankfurt A. M. 2 / 3 (1866) " and one-line cancel "franco" to Amsterdam / Netherlands. Complete letter contents, two stamps little tear, a crease. Visually impressive document in aboriginally condition. Abridged certificate with photo Sem BPP