The stamp looks like it's missing the horizontal perforations along the bottom edge of the stamp and includes what otherwise would be about a 1/8 to 1/4 inch selvedge at the bottom of the sheet. I collect Latvia and the stamps right after World War 1 show that error often.
Depends on the country and collector I guess. Latvian stamps such as this would sell for a premium over the regular stamp. You could always check ebay for possible prices.
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