8 Pfg and 12 Pfg "Conference of the International Labour Office (IAA) ", always with variety "hyphen zw. 10. and 15. is absent" - only on field 34 one part of issue occurring variety, in perfect condition mint never hinged, very rare, photo expertize H. D. Schlegel BPP: "the quality is perfect. ", Michel 1. 900. - in unhinged mint condition very rare most offered pieces this variety are hinge removed / regumed!