I've found several packages of wire. It is advertised as:

TBK-19 Equipment

Item 42

1 wire 240 inches long

DWG. NO. K-86268-1

RCA

It appears to be 41 or 42 strands of 10 mil tin plated copper so it is about equivalent to 14 AWG. Two layers of impregnated cloth insulation. The inner insulation is wrapped, the outer is woven.

Part of an installation kit?

Jim

Logic is a systematic method of coming to the wrong conclusion with confidence. Murphy