The stamps of Indian Convention States were stamps that had currency throughout British India with the name of the individual state overprinted on the stamp. There was some variety in the overprints in the early stamps. For example Patiala State was originally printed as Puttialla State in red as a "halo" around the head of Victoria. When the word "service" was overprinted on earlier stamps it appeared in red, later in black with some printed in smaller letters others in larger and in different areas of the stamp. Some examples are shown below. The half anna, second from the left on the bottom row, shows an error in the printing of Puttialla, being printed as Auttialla. These varieties did not last as the printing became standardized and by the late reign of Victoria and the accession of Edward the 7th these varieties had disappeared.
Illustration 2 shows the now standardized overprint on stamps of Edward the 7th. With an interesting new overprint of "telephone service" now in use