This photo I found on the web, date unknown, looks identical to the 1950s "Casa Van Nest" estate near low tide – so identical I think it may even be the same place on "Millionaire's Mile" in "Old" Islamorada.
The dock I helped my Dad and Grandad build (click more icon), replacing an older dock, had a rope banister and wood banisters at the end. A white wooden "Islamorada-style" beach chair is under a coconut palm near the dock. The photo was taken right after we finished the dock, before we put out the boat tethers and returned our three boats.