Like the LEGO City theme, LEGO City keychains are based on city life with the sets depicting city and emergency services, police, fire, airport, train, construction, and civilian services. Each keychain minifigure is based on City characters and such includes police officers, fireman, doctors and other City life minifigures in keychain form.
Summary
Gear Key Chains / City Swamp Police Key Chain set 853463 was released in March 2015, retailing for $5, but has since been retired. New, unopened Swamp Police Key Chain sets are valued at $8, while used sets can be found for $7.
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