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May I know the meaning of this mark which is found under a vase.
The mark which has a plus sign in a circle is a family crest of clan of Shimazu. About a family crest, it is explained here, and about the clan of Shimazu it is explained here.
薩摩｛さつま｝ was located in the southernmost part of Japan as a territory dominated by clan of Shimazu in feudal age of Japan.