From the estate of my grandfather Walter "Walt" Wright of Coldwater Michigan (K8TIY, SK). He was a Collins guy. I am not. I don't have any documentation for this item. From online sources it is obvious some parts are missing, including whatever fit into the two larger holes in the bottom left and right. I also point out some screws are missing from the back of the main panel. Please study the photos and bid accordingly. I removed the mounting arms for inspection and though there are scratches in whatever metal they are plated with (nickel?), there are no hidden rust gremlins under the plates that hold them in their channels.