That is a TX-800. Not sure who made them but it was rumored to have come from the remnants of the original Palomar. IIRC there should be a second board in there, also a 1X4 combo effectively making it a 2x8
Damn fine amp- one of the best I've ever owned (and have always regretted selling). In proper working order they are positively devastating and will PEP close to 1kW on SSB.
When they pop up on ebay they seldom go cheap. There was a second version of them labled 'LA900' Same amp, different label.
What made them unique was the 'heat' LED on the front panel. Even with those two fans it would get hot, and if it got a bit too warm it would shut down to protect itself.
Really a nice amp. The pics show it to be clean inside which means it hasn't been run hard. If you can get it under $275 or so, buy it. You won't be disappointed.
Just make sure you don't overdrive it, it can breathe and you have about 90-100 amps to feed it. Use the heaviest gauge wire you can find.