I think it is the same model set, apparently installed by Eisenhower:
http://www.eisenhower.archives.gov/a...l/Oval_Office/
No black goo, someone had been in there to clean it out before me (but long enough ago for lots of dust to build up since). I can tell for sure because they also dented that aluminum piece on top that holds the glass in prying it out.
(otherwise the cabinet is in nearly like new condition)
The battery is VS163 Eveready E163, I looked around no 4.2v batteries, but there may be some 4.5v batteries that might work (or if I can find 3 small enough 1.5v batteries).
After taking a good look at the chassis I can see a lot of repairs done before (mainly caps replaced). Also whoever worked on it before kept hitting wires with the soldering iron, melting the insulation in places, not so bad I want to replace them, but still I would have thought he would have been more careful on such a high-end set. That big replacement electrolytic on top of the chassis there, 80mfd 450v, is not actually replacing one of the power supply filters, but rather the 50mfd 50v cap which hooks to the contrast control, I wonder if he really meant to do that or just connected the wrong wire. The thermistor was broken and the wires were just twisted together there.
Was there originally some kind of metal cover that went over the bottom of the IF board? It looks like there might have been something like that there that was unsoldered and never replaced.