Answer:

rarity

Answer	Crossword Clue
RARITY	A flying pig, e.g.
RARITY	Quality prized by numismatists
RARITY	Unusual find

RARITY	Triple play, e.g.
RARITY	It doesn't happen often
RARITY	Albino, for one
RARITY	Hole in one, e.g.
RARITY	Blue moon, e.g.
RARITY	One for the books
RARITY	Antiquarian's find
RARITY	Highly unusual occurrence

RARITY	It happens once in a blue moon
RARITY	Unlikely occurrence
RARITY	It hardly ever happens
RARITY	Something unusual
RARITY	Blue moon, for instance
RARITY	Thinness.
RARITY	A no-run, no-hit game, for instance.
RARITY	A parking place, for instance.

RARITY	Blue moon.
RARITY	Snow in Miami.
RARITY	Odd sight.
RARITY	Collector's item.
RARITY	Something unusual.
RARITY	Tenuity.
RARITY	Thinness
RARITY	Uncommon thing

RARITY	Unusual occurrence
RARITY	Good used car, e.g.
RARITY	Curio
RARITY	Snow in Miami
RARITY	Snow in Tampa, e.g.
RARITY	Hen's tooth, e.g.
RARITY	Collectible, maybe
RARITY	Hole-in-one, e.g.

RARITY	One in a million
RARITY	Uncommon occurrence
RARITY	One-in-a-million thing
RARITY	Hard-to-find album
RARITY	Oddment