Here is my gen Rolex Speedking from 1961
it’s manual wind , acrylic crystal , 31mm , 17mm lug width
It’s on a Rolex expanding rivet bracelet dated from 1969
its one of my most worn watches and although the Speedking line is long gone it has a great backstory of being given out to officers who were prisoners of war during WW2
Steve McQueen wore a version in the great escape
I’m not sure why the model doesn’t get more love but i am guessing it is the size by modern standards is tiny !