Canal Zone, Dec. 12, 1904, 5c blue Map stamp (#12 with #9 and #17 pair) tied by 7-bar CANAL ZONE killers on REGISTERED cover with "ANCON, CANAL ZONE. / APR 26 1906 / REGISTERED." handstamp (Rg-1) and Cristobal Registry Exchange Label handstamp (RgXL-3) to United States. Backstamps include "CRISTOBAL, CANAL ZONE. / APR 27 1906 / REGISTERED." (Rg-3) and New York (5-3) and Boston (5-4) Registry Division handstamps. Premium Multi-colored Franking! Scarce & Attractive Registered cover.