As you can see there are x0xb0x adafruit that had not been built by their buyers. I built n° 901 not long ago. And even ML303! A Frenchman built a ML303 last year, bought on the forum uccaps!
The black and red is a technology transplant 1st generation recondonditioned.
It had a very bad sound in the past ... It was a TTx0x! I recycled it, picked up the encoders and switches, the dual transistors and 2SK30, soldered on a new PCB! The front panel is an x0xs0urce. It's a x0xb0x recycled recovery, now it's great sound!