i didn't buy it straight from him, at least twice removed. The former owner didn't but it custom but maybe the previous one. It's from the early mid 80s according to Tim Paterek when I asked him. His records got erased when his computer crashed so he could only guess.

in regards to overlap and going fast, i think it is actually more to worry about when going slow. if you are going fast one wouldn't be able to turn as sharp as one would going slow and hit their pedals (not to say you couldn't jerk your handle bars quickly and prove me otherwise). Which is very likely why steeper angles are found on track bikes where one is going fast.