China. (Indo-China Post Offices). 1922. Registered envelope addressed to the United States bearing Pak Hoi SG 56, 6c on 15c violet, SG 60, 14c on 35c olive and SG 63, 30c on 50c vermilion tied by Pak-Hoi-Chine double ring '9th Oct 22' with framed hand-struck 'R' routed via Hong Kong '12th Dec' with Atlanta and Chicago registered transits on reverse.