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These 140 mm puzzle pens are identical except for their base outer colour and the colour of the missing tile.
The year given here is an upper bound. This puzzle was shown in "The book of ingenious an diabolical puzzles" from 1994.
Thank you to the following people for their assistance in helping collect the information on this page: Sandy, Arnoud Blees.
This puzzle can be found in collections of these members:
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