The VR100 is a KTW62 supplied for RAF use. 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 WWII with the KTW62 used in the CR100.
The glas is coated internally and externally there are several codes.
The top of the assembly with the anode shorter than the rest of the electrodes. The control grid is wound on copper supports. The beam plates can be seen as bright plates left and right of the wire grids.
The rectangular cathode tube in the centre with notched rods supporting the grid wires and plain rods supporting the beam plates.
It is difficult to see but there is a lower circular screen at e bottom of the image with beam plates above.The anode is visible below the P9 on the glass.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 104 mm tall.