WIW am/fm Stereo Radio (Chevelle/Camaro)

[Coley]

Guys
...any ideas or information on this radio?
The best I can come up with is that it is for a 1969 or 1970 Chevelle or Camaro.
I came across this while searching for a 69-72 GM truck am/fm radio.
When I first came across it I thought I had lucked out but on closer inspection I realized it was not the truck version....although the front is fairly close in size.
Regardless, I am going to be testing it so see if it powers up...but I'm still trying to solve which of the connections is the power and ground. It appears to be very complete and generally clean as a whistle without a bunch of missing or cut wires and harnesses and alternative wiring stuff...luckily.
It appears to come with the factory auxillary (multiplex) amp that was for the Stereo part I guess.
Anywhoo....if you guys are up on this radio any feedback is welcome....not only some value guesstimates but the power/ground inputs on it.
Many Thanks!
Coley