[Arran]

 I believe that this chassis is shared with the 8K and with the Canadian G.E E-8/E-86, as well as the 7T and 7K which are the same except for the lack of a Magic Eye tube. One thing I can see straight away is that the chassis is missing the two filter capacitor cans, one was mounted on the right from corner, the other on the left rear corner. Also the IF can towards the left front of the chassis is a replacement, the original looked like the one closer towards the left rear with a pair of tunable slugs, top and bottom, rather then trimmer caps in the top as the replacement has. The speaker and it's cable are also replacements, RCA did not use Utah speakers, and their speakers also had a four pin Bakelite plug mounted to the rear with a matching socket on the end of the speaker cable like a 1940s Philco would have.
Regards
Arran