Pioneer Advertising Postal Card. Black; white. Cardstock. This Pioneer U. S. Postal Card has a One Cent "Columbia" imprinted stamp. It is postmarked 1884. The back is printed for the Leich, Vierling & Carlstedt, Wholesale Druggists, Evansville, Ind. It is dated August 27, 1884 and lists a billing, It advertises Raticide and Chondroleine.