The wires to this service are the old style. Two wire system with the old dark insulation that looks like it needs to be tossed out, but I’m sure it does the job just fine. The wire itself looks like aluminum but there are scratches that look like copper underneath. Is this copper-clad aluminum or just aluminum? This was just an electrical inspection and I didn’t see any knob and tube. Sorry about the pics, that’s all I got. What do you think?