Heinrich Köhler 383rd Auction – Day 3 Single Lots: German Empire 1872 – 1945 German Reichspost – Shield Issues – The Michael Rehme Collection (part II)

"FRANKURT A/MAIN 1 *a 26.8.75" very clear in red on face of valuable cover with red chalk mark "50" (Pfennig). The front with small marginal defects, mounted with hinges on backing. So far the only known cancellation of this Franco stamp