1924, philatelic exchange cover from Moscow to Berlin, bearing on reverse black surcharge 3k on Imperial Insurance stamp of 3r maroon on green network, tied by 7-line official cachet and signed (no facsimile) by Fedor Chuchin, franked by 13 stamps on front and reverse, arrival ds and all appropriate markings, F/VF, Standard Cat. #PE2, Est. $150-$200 (Image)