VERY FINE. A SCARCE BLOCK OF FOUR FROM THE ORIGINAL PROOF SHEETS SENT IN 1854 FROM TOPPAN, CARPENTER & COMPANY TO GREAT BRITAIN FOR USE IN EARLY EXPERIMENTS TO PERFORATE UNITED STATES STAMPS.
In 1854 complete sheets of 200 3c India proofs from Plate 4 were sent by Toppan, Carpenter to Bemrose and Perkins Bacon in England for a perforating experiment. Each firm received left and right panes. All of the proofs were cancelled with brush strokes to prevent use as postage.