This puzzle was made by Chad Valley around 1936 and was sold on board of the Queen Mary. Made out of carboard, it was designed to show the various levels of the ship as you put the pieces together. The pieces were held down by 2 screws and 2 nuts. The Queen Mary used to be a WWII passenger ship that carried troops. It was then used as a luxury liner. It is now used as a museum, tourist attraction, and hotel in Long Beach, California.