an article or object of particular interest or value because of its uniqueness or scarcity.
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British Dictionary definitions for collector's item
a thing regarded as being exquisite or rare and thus worthy of the interest of one who collects such things
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Other Idioms and Phrases with collector's item
An object of great interest, value, or rarity, as in This necklace is a collector's item. Originating in the early 1900s as collector's piece, a usage still common in Britain, the term in its present form is occasionally transferred to persons as well, as in The Beach Boys became a collector's item on the tour. [c. 1930]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.