This door hinge has the same markings.
Roto NT R Royal - Scissor Hinges
https://www.google.co.uk/search?q=Roto+NT+R+Royal+-+Scissor+Hinges&rlz=1C1GIGM_enGB531GB531&oq=Roto+NT+R+Royal+-+Scissor+Hinges&aqs=chrome..69i57j69i60l3&sourceid=chrome&ie=UTF-8
