1923 1c green, Rotary, perf. 11, light machine cancel, fresh color, trivial short perforation at bottom right, otherwise fine, ex-Grunin, with 1963 and 2019 Philatelic Foundation Certificates. Of the 15 known examples (all used), only five have machine cancels (the other ten have “Kansas City, MO” precancels) and only two are completely sound (the other two have varying degrees of faults, far more significant than the “short perf” mentioned here). This stamp is listed in the Siegel Census as 596-CAN-03. A major 20th Century U. Rarity, valued in Scott catalogue in the grade of fine. The item “#596 Used with Machine Only 1 or 2 Others Exist – SEE DETAILS (GP2 7/19/19)” is in sale since Friday, July 19, 2019. This item is in the category “Stamps\United States\1901-Now\ Used”. The seller is “garyposner” and is located in Rockville Centre, New York. This item can be shipped to United States.