HA 3141 2x40 and HA 3121 2x25--yours for the postage. Caveat: I got ripped off on these on ebay. The din cords are cut off, and the internal components look like they have been rearranged. The 3141 looks like somebody bridged it to make it an 80-watt mono to drive a sub; the 3121 has a few mysterious holes in the circuit board, as tho some small items were de-soldered. For somebody who knows what to do, these could be pretty good amps;otherwise, lots of parts. Many of the internal bits on the 3121 are marked NEC Japan.
Thanks to all on the board who shared info with me so I could figure this out before hooking up and frying my head unit!