#596 Used with Machine Only 1 or 2 Others Exist – SEE DETAILS (GP2 7/19/19)
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 … Continued