Hong Kong: Aerogramme Form - Advertisement Slogan Obliterated

This is a Hong Kong aerogramme form ("Form approved by postmaster General / Hong Kong No. 42", on reverse), which had an advertisement slogan printed at the bottom of the front panel. The slogan reads "AN / INVITATION / TO SAVE / FOR LATEST STYLES SEE INSIDE", see close-up below.

Avertisement slogans were not covered by the Postmaster General's permit, so the slogan needed to be obliterated by black bars.