1984, 20¢ Dogs, se-tenant block, imperf horizontally. O.g., never hinged, Extremely Fine, a very rare block of which on 8 are known, and of the 8 only 6 are in sound condition; with photocopy of 2004 P.F. Certificate. Scott No. 2101b  Estimate $5,000 - 7,500. $0 (Image)