I just restored my 54 pushbuttion radio but can't figure something out.

I have 2 wires coming from the radio. One wire goes directly to the ON/OFF Volume pot - Is this the 6v Power wire?

The other runs to a 1"x2" metal plate mounted on the inside top of the tuner case which then goes to the ON/OFF Volume pot. What the heck is this animal? Perhaps from the lightswitch to feed the dial light?

I apparently replaced both wires some time back with 14 AWG, so wire size doesn't give me any clue. I did have the radio working several years ago but can't remember the hookup.

Thanks for any help!