used 1851 "Mercury" (6)Kr. yellow (Type Ib) on medium wove paper, good to very large margins on three sides, touched at left. Fine fresh colour. A very good example of this rare stamp. Diena (1970) and Matl (1970) Certificates. Ferchenbauer 7, Ö.S.130,000. M.7, DM.12,000. Photo