[Boatanchors] Navy 7916 rig and S4 tuning eye tube

[Boatanchor@alliedinformation.com]

I am looking for some information on an old Navy (probably aircraft) 
transmitter model 7916. It is marked on the back of the rig as being made 
by the Stromberg-Clarson Tel. Mfg. Co. and is marked March, 1943. The only 
other markings are that it covers 2.1-3 MC and has small stamp that says 
"Accepted USN"

Does anyone know where I can get schematics for this rig?

One unusual feature of this rig is that in the back of the rig, where it 
would have been under a case and would have been very hard to see is a 
tuning eye tube. Its clearly a tuning eye tube, but the model number 
doesn't register with any tube database I can find. Its an RCA tube marked 
only RCA - MADE IN USE and S4. S4 doesn't seem to be a viable model number 
and there are no other marking on the envelope.

Any info on this radio would be greatly appreciated. Thanks.

Matt, KB8WFH