折おり紙がみ付つき

noun which may take the genitive case particle 'no'

guaranteed; authentic; certified

Literally 'with a folded paper certificate'; used to describe something whose quality, authenticity, or reliability is assured, often in a figurative sense.

• この店みせのラーメンは折おり紙がみ付つきの美味おいしさだ。

  The ramen at this shop is of guaranteed deliciousness.

• 彼かれの技ぎ術じゅつは折おり紙がみ付つきで、誰だれもが認みとめている。

  His skill is certified, and everyone acknowledges it.