2 1/2 on 2 1/2 Groschen large shield, block of four with post office numbers single circle "FRANKFURT A / M. 4 / 14.12.75", at the bottom a little separated and defects, very late the using up the 2 1/2 Gr. Stamps as 25 Pfg. -stamps in the year 1875, photo expertize jug BPP.