9 Kreuzer large shield brown with single circle. FRANKFURT A. M. N1 4.8.73 as correctly franked single franking on complete international fold letter with red one-line cancel "postage paid" to New York with arrival postmark (on stamp turning into), stamp with particular corner perforation and few slightly shorter perforation above very fine, very scarce single franking with this colour in good total maintenance, Corresponding photo expertize Krug BPP