かすがいじゃありませんでした
鎹じゃありませんでした
kasugaijārimasendeshita

Noun
Desu Copula

The polite, past negative form of かすがい

1. Was not (a metal fitting); Was not (a tool/implement); Was not (used as a surname)

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana