Canal Zone, Dec. 12, 1904, 8c on 50c bistre brown Map stamp, red brown PANAMA overprint, 2nd special printing (#14c) & 2c on 1p lake Map stamp (#17) tied by 7-line CANAL ZONE killer with matching ANCON, 4-26-1906, REGISTERED cds (Rg-1) on REGISTERED cover with Cristobal Registry Exchange Label handstamp (RgXL-3) to United States with Cristobal (4-27), New York (5-3) & Boston (5-4) registry backstamps. Ex-Gibbs. Very Scarce & Attractive 14c Registered cover!