Proof 1c-6c 1873-75 Bank Notes, trial color plate proofs on India (156TC3, 158TC3, 159TC3, 179TC3), strip of four and single of 1c, L. margin single of 3c, block of four of 5c, block of eight of 6c, all in black, card mounted, ample to large margins, very fine, Scott retail $512.00est.