The CV1673 is a receiving triode. The anode is shaped from pressed sheet that is formed with ridges for extra rigidity. The commercial valve HL2 was introduced in 1931. The CV specification says that the valve was also known as POVT105 as a GPO valve.
Looking under the silvering of the gettering one can see the filament as a single inverted V and that the filament tension spring and grid top supports are held in a glass rod that also attaches to the anode supports. HL2 has a similar construction and the use of the glass support points to an early batch and to Azide methods of construction.
A closer view of the grid.
The balloon envelope is 43 mm in diameter and, excluding the B4 base pins, is 95 mm tall.
References: Data-sheet & 1040 Type CV1673 was first introduced in 1931.