1 kreuzer large shield, green (2) in mixed franking with 7 kreuzer large shield blue as properly franking on cover from single circle postmark "FRANKFURT A. M. 7 / 5 74" to London / England with arrival postmark, cover defects from opening the cover, photo expertize jug BPP (2018) "all stamps are fresh colours, good embossed, well perforated and in perfect condition. Unusual franking combination from known correspondence. "