1856, 1 Fr. Seated Helvetia, violet gray, having full margins extremely fine copy from corner margin lower left, neat cancelled with single circle "Basle LETTER-EXPEDITION 8. April 5.11 M", photo certificates Ferchenbauer and Rellstab International Association for Philatelie Experts: "in good condition. ", Michel 1.000.- (Zumstein No. 27 Db)