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As far as I know, less than a dozen of these game boxes exist today.
(VIEW HERE) On Dec 31, 1935, Parker Brothers was issued a patent for Monopoly, patent 2,026,082.
Parker Brothers applied for their own patent and the next group of their games stated PATENT PENDING or PATENT APPLIED FOR. This statement was used for a while in 1935, but they discovered that there were other games very much like Monopoly already with patents.
To protect their investment in Darrow's Monoply game, they decided to purchase the 1924 patent to the Landlords game and added that patent to their Monopoly games. In the meantime, PB applied for their own patent on Monopoly.
In 1935, Parker Brothers (PB) bought the rights to Monopoly from the 'inventor', Charles Darrow. PB immediately began selling Monopoly games using the Darrow game parts.
The first games Parker Brothers made were marked TRADE MARK. This included a small number of the No 9 long box, very rare today.
These patents remained on all Monopoly games until 1941 when the Magie patent expired and was removed.
1936 was a busy year for Parker Brothers and their Monopoly game.
It was produced in limited numbers for only a few months in mid-1935.
Once Parker Brothers figured out Monopoly was taking off, they decided to offer a variety of different game options.
One of the first things changed was the color of the box from black to blue.
When the 1924 patent expired in 1941, they dropped that number from the labels and used only the later patent issued to them.
The phrase A PARKER TRADING GAME was added to the box tops in 1937.
Canadian Monopoly games were introduced in 1936 and closely resembled the U. (Thanks, JP) The game boxes pictured below show different label designs and kind of a chronology of manufacture.