昭和 しょうわ いち けたではありませんでした
shōwa hitoketadewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 昭和一桁

1. Was not a single-digit Showa era.; Was not from the first digit of the Showa era.

Past/Perfective
Negative
Polite
Formal Register