一いっ点てんもの

noun, noun which may take the genitive case particle 'no'

one-of-a-kind item; unique piece

Refers to a single, unique item, often handmade, vintage, or limited edition. Commonly used in fashion, art, and collectibles.

• この一いっ点てんもののドレスは、世せ界かいに一ひとつだけです。

  This one-of-a-kind dress is the only one in the world.

• 一いっ点てんもののアクセサリーを集あつめるのが趣しゅ味みです。

  My hobby is collecting unique accessories.