Switzerland, Zürich, 1843, 6rp black, vertical underprint, tied on piece by red rosette cancel with matching townmark above, uncommonly large margins showing portions or all of guidelines on each side, sharp crisp impression, Extremely Fine and choice, an exceptional example of the Zürich 6rp Vertical Underprint Cantonal issue; with 1994 Rellstab certificate. Zumstein Nos. 2S. Scott Nos. 1L2  $1,750. $0 (Image)