5'th classicphil Auction - VIENNA- AUSTRIA

1860, 3 d., slate blue, rare plate proof with thin outer line BEFORE HARDENING, for the perf issue 1860-61, unused without gum as issued, in the lower margin is the thin line of the next stamp, page 97, Robson Low, rich colour and a desirable imprimatur, VF!. Estimate 1.000€.