There is a project Williams Flash for sale in Columbus Ohio for $800. They sent a very blurry picture of it. I bantered back and forth with them on value and they felt it was worth that and are firm. If youre interested i can pass along their contact number.
Not a good picture. It has a lot of dust on it. It will turn on but will not start game. Been sitting in the basement for several years. It's a 1979 William's Flash pinball machine.