I would have thought that the D above the pointed arrow would have stood for Defense Department as is the norm in Commonwealth made or repaired rifles, what is the (W) meant to stand for, (Workshop maybe)?
Also a quick google check finds the that the Indian Department of Technical Education did not exist during the time of this rifles manufacture in 1950, they actually referred to it from it's founding in 1945 as the -
"All India Council for Technical Education (AICTE) was set-up in November 1945 as a national level Apex Advisory Body to conduct survey on the facilities on technical education and to promote development in the country in a coordinated and integrated manner. And to ensure the same, as stipulated in, the National Policy of Education (1986), AICTE be vested with statutory authority for planning, formulation and maintenance of norms and standards, quality assurance through accreditation, funding in priority areas, monitoring and evaluation, maintaining parity of certification and awards and ensuring coordinated and integrated development and management of technical education in the country."