The Maha Kumbh at Prayagraj and the Simhastha Mela of Ujjain are among the prominent religious events featured in the collection of more than 100 rare stamps and special postal covers preserved by two philatelists in Indore.

Their collections boast of a special cover focusing on the Maha Kumbh held at Prayagraj in 1977 and a "bazaar postcard" (used for writing letters before independence) of the Maha Kumbh in the Uttar Pradesh city in 1906.