I acquired two interesting Apple II Rev 3 motherboards. One is a board that was thought to be a clone but I wanted to explore if it was actually a prototype. As with the Apple II Rev 0 prototype, one of the Rev 3 motherboards has no solder mask or graphics.
I've gone through it with a fine toothed comb and I cannot find any difference from a normal Rev 3 motherboard. What I don't know is if there was a clone that was that exact at the time. Does anyone happen to know?
I am attaching some images for review.