It's one level lower than the TX-SV525 I used to have. The 525 is rated 85 wpc in stereo, 50 wpc center, and 30 wpc for the surrounds (in those days the center and surrounds had less power than the main channels).
I believe the 4xx series of the time was rated 65 wpc in stereo. The center and surround channels were probably the same as the 525.
It's one of the first era of ProLogic receivers and is pretty old by now (I bought mine in 1996). It's probably only worth $25-$40 because prices for mainstream electronics drops like a rock and for the original purchase price of that receiver (around $300-$400) you can get a new model that is orders of magnitude more advanced.
If it works well just keep it. It will work perfectly for a stereo receiver in the garage or patio. My old 525 currently lives in my sister and brother-in-law's garage and is working flawlessly to do this day.
