Nothing is known about the Insured label on salmon with black lettering. It is previously unrecorded and the cover shown above is believed to be the only example extant.
In a similar vein, 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 encourages speculation that the individual ports printed their own labels. Any information regarding these labels would be welcome.
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 Jun 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). The dates of the sinking of the Laconia, however, do not match 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.