My father worked for a company in India that produced printing ink which was used both in the production of the Indian rupee notes and in Indian postage stamps. Consequently I received quite a few stamps as gifts as a result of this connection. The postings today is of a First Day Cover of the first stamps of Bangladesh given to me when I lived in Calcutta in 1971. Calcutta is very close to the border with Bangladesh.
I came across the following website of a collector in the USA of Bangladesh stamps which might be of interest. The stamps are post marked 29 July 1971, I think Bangladesh declared independence from Pakistan on 26 March 1971 which then started a civil war.