porcelain vase

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I have a beautiful vase that has japanese signature on the bottom encased iin a square. On top of that is the word "Seizan" and underneath the signature is the word Japan, which denotes that it is prior to the occupation, and I believe should make it late 19th century, although I could be wrong. Has anyone ever seen this mark and if so, can you update me as to the era it was made in? Thanks