cover 1901 (7 Aug.) Q.V. 10c. registered envelope (size H, crease and soiled) bearing additional 10c. blue and 30c. green (4) tied by Hong Kong registered c.d.s., addressed to Mexico and bears second type "HONGKONG/CHINA" registration label, El Paso, Texas registration label, Mexico registration handstamp plus another registration handstamp on face, the reverse with Seattle and El Paso transit marks; very scarce. Photo