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By the end of 1936, all the boxes with this label design were switched to the blue color.
The 'Trade Mark' game is the ultimate Parker Brothers Monopoly game for a collector.
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.
It is estimated that over 100,000 'Patent Pending' games could have been made.
No Number 9 White Box games are known with the PATENT PENDING statement on the box. After purchasing rights for Monopoly from Charles Darrow, research discovered another game very similar to Monopoly had been patented in 1924 by Elizabeth Magie.
By this time, Parker Brothers realised the game was going to be a hit so production was ramped up considerably.
Dating early Monopoly games is done by the patent numbers and cities listed on the labels.
Most early games can be dated within a few years using these label elements. The earliest known Canadian game is the No 9 White Box with legals stating CANADIAN (Trademark) REGISTRATION APPLIED FOR and CANADIAN PATENT APPLIED FOR, described below. CLICK HERE and you will go to a page from another Monopoly collectors web site showing a detailed list of dates for the legal statements on game boxes and boards.
Please feel free to email me with corrections, questions, or comments.
Also, check out the online Vintage Monopoly Game Collectors group This style box was a Darrow design and Parker Brothers just continued production using his design.