You can measure 165ft on a 50m tape
Well a tape in two units will presumably finish each unit at a round number. 50 m is very close to 164 ft, so they've stopped the markings at 50 m on one side and 55 yards / 165 ft on the other.
I would be most amused to see a tape stop at 164 ft and 129/256 of an inch, just to annoy anyone using imperial units.