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)