Neither I nor the artists copying the marks on the original read Japanese, however, the notes at the site where I found the original indicate it had something to do with commemoration of an event, and includes a date for 1921. http://kutani.wordpress.com/2008/02/18/japan-kutani-porcelain-sake-cup-monkey-okame-guinomi/
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http://kutani.wordpress.com/2008/02/18/japan-kutani-porcelain-sake-cup-monkey-okame-guinomi/