極きわめ付つきの品しな

noun

certified genuine article; guaranteed authentic item

Refers to an item that comes with a certificate or guarantee of authenticity, often used for antiques, artworks, or high-value goods.

• この茶ちゃ碗わんは極きわめ付つきの品しなで、箱はこ書がきも残のこっている。

  This tea bowl is a certified genuine article, and its box inscription is still intact.