真経津の鏡
まふつのかがみ
Mafutsu no Kagami (alternate name for Yata no Kagami, the mirror of the Imperial regalia)
真澄の鏡 is read as ますみのかがみ (masumi no kagami) and means perfectly clear mirror.
ますみのかがみ
masumi no kagami
まふつのかがみ
Mafutsu no Kagami (alternate name for Yata no Kagami, the mirror of the Imperial regalia)