The VR100 is a KTW62 supplied during WWII for RAF use (note the up arrow on the paper label). After 1941, with the advent of the CV register, it was re-named the CV1100.
It is a vari-mu IF kinkless tetrode of the 6K7 class but with slightly more gain. Thousands were supplied during the WWII with the KTW62 used in the CR100.
Looking into the top of the valve shows the control grid connected to the top cap and two other rods. The middle rod is notched and is clearly a wound grid (screen grid) the outer pair of rods have no obvious notching and indicate that the beam plates are attached to these supports.
This image confirms the presence of two wound grids and metal plates attached to the outer rods.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 103 mm tall.