I too acquired a "Westly Richards" stenciled transit chest, with bren gun, that follows the same general Inglis Mark 1m* conversion to Mark 3 pattern. The base gun was Inglis 1942, with the Royal Factory Ishapore F.R. in 1961 (or 2, as I am going from memory). The indians substituted RFI and SAF parts as required to complete the guns.
They were sold as converted autos for around $800 many years ago and that price included a spare barrel, with the rifle and case