细节
XU 7Kr. Prussian blue, the horizontal pair with good margins on three sides, touched at lower right and with small crease and light toning at upper right corner, on small 1869 envelope to San Francisco, cancelled by a fine strike of the single ring "MÜNCHEN 25/JUN 69" d.s. and showing "FRANCO" and "NEW YORK PAID ALL JUL/15" c.d.s. in red adjacent. Unique and undoubtedly one of the most important items of the imperforate Arms issue. Signed Pfenninger. M.21c. Unpriced by Sem. Photo in colour