3 Ngr. King Johann I., two folded letters each with single franking, but essential is the reverse mounted Prussian frame railway mail cancel post SP. BUER. IV. GOERLITZ-KOHLFURT, the once in black and once in red exists. in the Grobe handbook appraises the red already approximate 600,-- Ç, the black is to indicated still rare and heavy guessable. both covers in superb condition (former starting price 150)