There are rumours now and then that the Rolex Oysterquartz 5100 was supposedly designed by Gerald Genta before he came up with the design of the AP Royal Oak a few years later. Please also see the article on Salon QP from 2016: ...
And what the mean with sport, the first R.O.s where not for swimming. The Oysterquarz case also exist with an automatic movement as , very rare and sought-after. Best