The CV1944 is a triode hexode frequency changer. The prototype was the 6K8G and the CV1944 is identical.
A previous owner has tested this as a 6K8.
The screen covers most of the electrodes but the lower parts can be seen. 6K8 has a diagram of the internal layout. In this image the hexode anode is on the far left and the triode anode is on the far right. The inner grid is two sided and forms the triode control grid and the mixer control grid where the local oscillator injection to the mixer takes place.
The triode anode at the front with the coiled insulated heater easy to see.
The cathode with the double sided grid around it. The grid winding passes flat across the cathode and keeps a constant distance to the flat anode.
Reference: Datasheet. Type CV1944 was first introduced in 1938.