15c Gray (566). Mint N.H. with top plate no. 18930 selvage, incredibly wide margins, wonderfully well-centered, strong color, Extremely Fine Gem, a striking stamp, ex Dr. Morris and Dr. Killien, with 1990 P.F. and 2006 P.S.E. certificates (XF-Superb 95 Jumbo; SMQ $350.00)