[Boatanchors] Collins C-200 tube

[Larry]

I have one of these C-200 tubes.  I'm not finding reference to it on the 
internet.  One site mentions the C-100 and

the Collins 30FXC transmitter.  Another shows the C-204 etc tubes but 
nothing so far on the C-200.  Not even a date.

It has a 4 prong base and the grid comes out the side of the tube.  
Bigger than the 813 with a large plate cap on it.

Anyone with specs or info?

Larry W0OGH