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From what I can gather so far, Nippon Yokohama Imura china is from the late Meiji period, circa 1890 and may have extended through at least the early Taisho (1912-1926).
Varied UK and US sites date Nippon Yokohama Imura Zo anywhere from 1890-1920's. The Japanese sites I have found state this porcelain as mainly Meiji era (1868-1912) but some seems to have been produced in the Taisho period (1912-1926) as well.
See links:
www.tanabetetsuhito-collection.jp
books-jp.com/index.php?route=product/product&product_id=396
https://www.old-noritake-antique.com/item/u0580.htm
https://www.old-noritake-antique.com/item/u1540.html
日本横浜 / 井村造 Nippon Yokohama / Imura zou (made, decorated). His full name is 井村彦次郎 Imura Hikojirou, active in Yokohama since around 1875, specializing in scenes of 花鳥風月 "kachou fugetsu" "flowers, birds, winds and moon," well recognized for his work, together with 宮川香山 Miyagawa Kazan: https://www.old-noritake-antique.com/item/u2393.html
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