An old side-paddle-wheeler in the Pussur River near Chalna (now Mongla Port), East Pakistan (now Bangladesh) in April 1964. I could not identify it at the time, nor since.
The Joint Steamer Companies (Rivers Steam Navigation Co. and India General Navigation & Railway Co.) operated a number of very similar vessels in Bengal, some (most?) of which were built by Wm. Denny's of Dumbarton or locally to Denny's designs in the late 1920s. They operated either independently or with barges lashed alongside.
The Rivers S.N. Co. had strong connections with the British India S.N. Co. & carried the same funnel colours (black with 2 closely-separated white bands), as does the vessel in this photo, so it's possible that this is an ex-RSN vessel.
After India/Pakistan independence in 1947 the RSN became the Pakistan River Steamers Co., and following the further independence of Bangladesh the government nationalised the company as Bangladesh River Steamers Limited. It was reported that some of these paddle-wheelers were still operating at least until the late 1990s.