It is a 50 hca as stated above. They came in different colors and sizes through the years. I remember red, blue and black for the one you have pictured. This one would have been from the early 90's. Some of the blue ones even came with american flag boards. They were a "cheater" amp copied from an orion hcca series. Any info you find on an orion hcca 250 is accurate for this one.
50x2 @4ohms
100x2@2
200x2@1
400X2@.5
200x1@4
400x1@2
800x1@1
snr 100db
thd .006
fr 50-50k
Orion sued them in the late 90s and they had to change the guts. The power dropped quite a bit then. I think the lower power one was the 50hc after the lawsuit, to many years ago though, not sure. It had a different heat sink than this one though. And did not have the orion style guts. If you soldered in a heavier power and ground and upgraded you electrical to feed them well, they would go 1600x1@.5 ohms or 800x2@.25. Almost all of my sub amps are os orion hcca. 15-20 years later they are still going strong. What can be said about them can be said about this line up of the os us amps.