| Cancel Image | Description | ERD Stamp | LRD Stamp | Image Front | Image Back | Date of Cancel | Total Franking | Values Used | Destination | Notes | Contributor |
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Dr. A.M.T. Cheung has done substantial research into the Circular "T" postage due markings on Hong Kong and the Treaty Ports. It appears that most of these markings originated in Hong Kong (and there are a number of types) but it is also believed that Canton, Hankow and Shanghai had their own.
Nothing is known about the Insured label on salmon with black lettering, it was previously unrecorded and the cover shown above is believed to be the only extant example.
Similarly, the insured label in pink with black lettering is also unknown. The design is similar to that of the salmon label used on the cover from Shanghai, which supports the idea that the individual ports printed their own labels.
The Insured label in magenta with black lettering was supplied to the post offices in gummed sheets.
The Buy War Bonds handstamp appears on the back of the cover shown under Canton dated June 26 1918.
The Damaged by Sea Water handstamp was previously thought to be attributed to the loss of the Laconia (and has been listed as such in numerous auction catalogs), however the dates of the sinking of the Laconia do not match the examples we have and research by Janet Klug has shown that this handstamp and these two covers must have come from the sinking of the S.S. Manchester Spinner which was sunk by German submarine U-27 off the coast of Malta on January 22, 1918, en route from the Far East to Britain.