Most of them are well worn but the ones shown are mine so the best I could find. Apart from the black one, which for some reason there were quite a few almost new, the rest of the "set" are hard to read as they are well used.

Not sure about when they were on the tables but personally I think they are the nicest looking ones of the American roulette chips that they did use. Most of the boxes that they came in are dated 30/01/76 so I assume that's when they were boxed up after being taken out of circulation although, obviously, they may have been moved around since being boxed.
All the other styles/molds to follow on this thread so I don't clutter up the board.