[Milsurplus] Navy SSB-1 followup info

[Nick England]

I have just acquired a NAVSHIPS 92917 manual which covers the Navy's version 
of the RCA SSB-1. Evidently they procured the original LSB-only version 
(marked just SSB-1, not SSB-1 Mk II or whatever), so that answers my major 
question.
I've added some more photos and info to my SSB-1 web site, 
http://www.virhistory.com/navy/xmtrs/ssb1.htm , including a cutaway of the 
RCA mechanical filter used in later s/n (the earliest s/n used Collins 
F250Z-4 filters).

I have info on the original (Mk I?), the Mk II, and the Mk IV - has anyone 
got info or photo of the Mk III ? Would also like a block diagram and/or 
tube lineup on  the Mk IV - am I correct in thinking these used 7360 
balanced mixers instead of the earlier 12AT7 circuit?
cheers,
Nick K4NYW
www.virhistory.com/navy