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Aizu Domain (Japan)

image by Kazutaka Nishiura and Peter Hans van den Muijzenberg, 23 March 2014

See also:

Aizu Domain ensign

image by Kazutaka Nishiura and Peter Hans van den Muijzenberg, 23 March 2014

Located at Fukushima Prefecture. Last lord's name: Matsudaira Katamori. They used white field charged with black Chinese character Ai of Aizu in the center as domain's army flag and naval ensign.
白地黒會文字旗
Nozomi Kariyasu, 23 March 2014

"Aizu" means "signal" doesn't it? But it's not that word, I assume.
The flag is a 5:4 high flag. Since you told us army flags were high flags and ensigns were horizontal, I assume the version you sent is only for the army.
I leave it to the readers of Japanese to say whether I got the character right, as I don't know how much variation would be acceptable.
Peter Hans van den Muijzenberg, 25 March 2014

In this case Aizu is place name.會津 and signal is 合図. The character reads well. It is acceptable.
Nozomi Kariyasu, 23 March 2014

image by Kazutaka Nishiura and Peter Hans van den Muijzenberg, 23 March 2014

They also used white field charged with black Aizu hollyhock in the center which is looks more similar to nuphar. Shogunate branch family used a variation of Tokugawa hollyhock crest.
白地黒會津葵紋旗
Nozomi Kariyasu, 23 March 2014

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