The name Geo Space Corporation, which is on the transformer has a little logo on it of the letters GS. And that same or very similar logo seems to appear on each of the channel strips. So that's probably the name at least. Model number? No clue.
Could have been custom built by somebody who knew what they were doing, as far as sturdy hardware. Maybe it was a piece of Road Gear. It looks like all identical input modules. No mixer section, or meters?