cover 5c Buff (67), horizontal pair, rich color, tied by 'Hanover, N.H. Feb 5' c.d.s. and target on fresh 1862 orange buff cover to Canada, 'Derby Line, Vt. Feb 6' exchange h.s., 'U. States' in arc h.s. on reverse, Canadian backstamps, ms. docketing at L., R stamp small faults from very slightly overlapping cover edge, otherwise very fine, rare and attractive, a scarce usage of the 5c Buff, signed Vincent G. Greene, with 1990 P.F. certificate, Scott retail $1,600.00+ photo