あかちくしかもであれば
赤筑紫鴨であれば
aka chikushikamodeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of あかつくしがも

1. If it were Akatsukishigamo…; If Akatsukishigamo were…

Ba Conditional
Usually Written in Kana