The Convention States are those which had postal conventions (or agreements) with the Post Office of India to provide postal services within their territories. The adhesive stamps and postal stationery of British India were overprinted for use within each Convention State. The first Convention State was Patiala, in 1884, followed by others in 1885. The stamps of the Convention States all became invalid 1 January 1950.

The Feudatory States maintained their own postal services within their territories and issued stamps with their own designs. Many of the stamps were imperforate and without gum, as issued. Many varieties of type, paper, inks and dies are not listed in the standard catalogs. The stamps of each Feudatory State were valid only within that State, so letters sent outside that State needed additional British India postage.

- Mrs. Nagalakshmi Tadakaluri, Philatelist.

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