2c Black Jack, Trial Color Plate Proof on India (73TC3).
Four blocks of four, incl. Gray Black, Green, Rose Red, Pale Rose Red, all have ample to large margins except one stamp just touched on first block, few faults incl. creases and tiny margin tears, most appear Fine-Very Fine, very rare blocks, Scott Retail as singles
Image Magnifier / Download
Power Search for Comparables