5c Brown Q die (RN-Q2), imprinted at center on extremely ornate and colorful 1872 Commercial Travelers National Association (NY) membership certificate, 6¾ x 3¾", Black on violet tint on white, a magnificent revenue stamped paper piece which combines the elements of an extremely rare RN and a gorgeous document in exquisite condition, small light corner crease, otherwise extremely fine, believed to be unique, Scott retail $2,250.00, Castenholz $2,200.00 photo est.