Heinrich Köhler 385 Auction – Day 1

“FIRST AERIAL POST U.P. EXHIBITION ALLAHABAD 1911”, good strike in magenta on Edward ½ a. green on envelope to Bombay with “ALLAHABAD 18 FE 11” despatch and Bombay arrival on reverse, the latter one enhanced, small tear in the backflap closed with scotch tape, minor toning, otherwise fine and scarce, certificate RPSL (2023)