珍ちん中ちゅうの珍ちん

expression, noun

rarity among rarities; rara avis; black swan

Emphatic set phrase meaning something extremely rare, literally 'rarity among rarities'. Used in both literal and figurative contexts.

• この切きっ手ては珍ちん中ちゅうの珍ちんで、市し場じょうにほとんど出で回まわらない。

  This stamp is a rarity among rarities and hardly ever appears on the market.

• 彼かれのような正しょう直じきな政せい治じ家かは珍ちん中ちゅうの珍ちんだ。

  An honest politician like him is a black swan.