Tripolitania. 1930, Zeppelin issue, Mercury and Zeppelin, 12L deep blue, right sheet margin single imperforated on the right, nicely centered and very fresh, full OG, NH, VF and extremely rare, only a few such errors recorded, expertized by G. Bolaffi, Sassone #PA25a, C.v. €27,500 as NH, Est. $3,000-$4,000 (Image)