5'th classicphil Auction - VIENNA- AUSTRIA

1918, 5 m., on 1 p., cobald blue, black opt type 2, block of four from the lower left corner with sheet controls B 18 + A opt in black, transfer G, with KNEE variety on pos 110, no gum as issued, a rare positional multiple, cert Kaufmann, XF!. Estimate 2.000€.