A Google search reveals that "One of the popular photographic papers used for printing postcards was Kodak Professional AZO Paper. Postcards produced on AZO paper had AZO stamp boxes on the back. The style of these boxes varied over time."
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Halton Images is created and maintained by the public libraries of Halton Region, the Burlington, Esquesing, Milton, Oakville and Trafalgar Township Historical Societies.
A Google search reveals that "One of the popular photographic papers used for printing postcards was Kodak Professional AZO Paper. Postcards produced on AZO paper had AZO stamp boxes on the back. The style of these boxes varied over time."