Ok here is what I have so far, after removing the chassis, the only noticable repairs were replacing a few tubes, nothing later than 1952. a good sign? after looking at the sams, it may be that someone recaped the set in that time frame as it has alot of "BEES"
the sams clearly shows traditional paper styles. I noticed an RCA connector on the side of the chassis, not accessable unless you pull the chassis. my bet is signal injection point? also there is a switch on the back. not listed in the service notes.