Spectacular Carl Zeiss "Zielmultar" variable and torch combination claw mounted on pre WW2 big bore vierling.
Notice the double safety, the second set of sidelocks, and the separate lamp battery.
Judging from the engraving style that gun seems to have been built for India.
Perhaps our friend Kuduae will be able to find more info about that impressive rifle.

DORLEAC
www.dorleac-dorleac.com