Hoping someone has a manual or can send me to a source for info. This radio looks like a BC-348 but is way different  inside. BAMA materials and some websites cover  224s, but not early model like this one ( has tube 41, 6F7 and wiring colors not the same, among other things). Was made for the Army  by RCA requiring 12v not 28v. Appreciate any help.

Dale K5AJZ