Canal Zone, Dec. 12, 1904, 8c on 50c bistre brown Map stamp, carmine PANAMA overprint, 1st special printing (#14, minor defect) & 2c on 1p lake Map stamp (#17) tied by 7-line CANAL ZONE killer with ANCON, 4-14-1906, handstamp (Rg-1) on REGISTERED ISTHMIAN CANAL ZONE, ANCON HOSPITAL. OFFICIAL BUSINESS cover with Cristobal Registry Exchange Label handstamp (RgXL-3) to United States with Cristobal, 4-15 (RgRc-1) and New York, 4-22, backstamps. Ex-Gibbs. Scarce & Attractive Postal History item.