Canal Zone, 1917, 12c purple & black, tied by cork cancel on registered cover to Indianapolis, Indiana, purple registry boxed handstamp and reverse with "Cristobal, C.Z., Registered, Aug 18, 1920" cds, N.Y. transit and receiving backstamps, slightly reduced at top, Very Fine, scarce usage. Scott No. 49  Estimate $100 - 150. $0 (Image)