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The 1953 World on Wheels set began as a 160 card set when it was first issued in 1953, however an additional 20 cards were added to ensure the set included the newest models of the time. The latter 20 cards are significantly more difficult to find than the original 160 cards. The label that appears on packaging shows the title of the set as being only “Wheels” but the “World on Wheels” name has caught on, based on the card markings.
2009 Topps Baseball Factory Retail Set
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2009 Topps Football Factory Hobby Set