This set sold at auction recently. It was framed and labeled as an original and complete Mercury set.
It wasn't. Mercury only issued three boxed sets with a much smaller selection of aircraft.
One of our talented members, Bob Dros made up the background to which the aircraft were attached. It is a beautiful way to display them BUT.........it isn't complete either.
Here is the Quiz question: One known variant is missing from this collection. Which one is it?