Indore State, also known as Holkar State, was a royal state in India. Its rulers belonged to the Holkar dynasty. Indore was a 19-gun salute Maratha princely state (a rare high rank) during the British rule in India.
Indore state was located in the present-day Indian state of Madhya Pradesh. The capital of the state was the city of Indore. The state had an area of 24,605 km2 and a population of 1,325,089 in 1931. Other important towns besides Indore were Rampura, Khargon, Maheshwar, Mehidpur, Barwaha, and Bhanpura; there were a total of 3,368 villages.
The first stamps were issued in 1886 during the rule of Maharaja Tukoji Rao II Holkar who reigned from 1844 to 1886.
The stamps consisted of ¼ Anna of various shades of mauve. They were lithographed, gummed and perforate 14 ½ – 15. They were printed on thick white paper or thin white paper or yellowish paper.
* Text from Wikipedia and feudatory-states-stamps.com