Inscribed 'Shrine Visitation Commemorative, Iwate Gokoku Shrine'.
This shrine is within the Morioka shrine in Iwate Prefecture.
This cup appears to be a pre-WW2 item.
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Shrine cups page 2
Meiji Shrine
Uncommon Shinto shrine design. Inscribed '[Tajika?] Unit,
Visitation Commemorative.'