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JO7 and J(zero)7 don't come up in USA search engine. Marks vary by country. You live in the melting pot state of the USA (New York) so it could be from any country.
If you search doll dress mark Jo (or 0)7 by other English speaking countries you might find it.
My guess is Japan 2007, but it could be January, June or July 2007 too.
Or maybe it's a U, not a J, or a D not a O...maybe it's not a doll...can't see it.
that's why pictures help.