LEGO has released a number of key chains sets over the years based on many popular themes, including licensed themes. Most feature a minifigure attached to a key chain, although some simply have a LEGO brick or another LEGO element.
Summary
Gear Key Chains / Power Miners Duke Key Chain set 852863 was released on March 3, 2010, retailing for $5, it has since been retired. New, unopened sets are valued at $6, used ones can be found for $5.
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