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Definition of Convention state
1. Noun. (philately) any of the Indian feudal states which, during the time of the British Empire, used overprinted Indian stamps valid for postage outside the state. ¹
¹ Source: wiktionary.com
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1. Noun. (philately) any of the Indian feudal states which, during the time of the British Empire, used overprinted Indian stamps valid for postage outside the state. ¹
¹ Source: wiktionary.com