The VR116 is an HF pentode and has an external metalising that obscures the electrodes and construction.
The VR116 was specially designed for the use of the suppressor grid as a control electrode and has a cut-off of -10 Volts. See the transitron aricle above.
Such methods of screening were popular for valves for intermediate frequency amplification and radio frequency amplification. The grid brought out to the top cap for maximum isolation also suggests a high frequency use.
The VR designation tell us that the valve is a British military (RAF) receiving type from before 1941 when the CV system was introduced.
This exhibit has been double stamped with the identification information. Also on the envelope is the old stores code of 10E/266.
The reverse is plain zinc loaded screening paint.
The classic envelope is 32 mm in diameter and, excluding the MO base pins, is 80 mm tall.