I bought it for €5 at the flea market. I didn't expect much of it, but the amp was in excellent condition, except for the dirt on the front panel!
I don't now when it was manufactured, despite having taken it apart. Its output powers seems to be 2 X 40 W into 8ohms
The audio quality is good, it's a Pioneer.
For such a ridiculous price, I would buy several of them if they were in the same condition!!!

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The 2X 70 W output power you say might be the musical power, I think.
I really don't think this amp exceeds 2 X 50 WATTS given its amplification connector board, but I have no means to measure the real power.
And I don't have the documentation that comes with it, which is a pity because I'm very curious about the tech specs.
I wonder how much this amp would've cost back then, but you probably don't know that either and if it was a present it probably was part of a complete audio system...
Thanks for the info, anyway. I hope this "cheap" amp serves me as well as yours has served you.
Regards.