Late 1920's Kenzo Okada

This painting was acquired by my grandfather while stationed in Japan, after WWII. Where he was told it was painted by a Mr. Kenzo Okada in the late 1920's while Mr. Okada attended the Tokyo School of Fine Arts. The painting is 10 1/2 x 24 inches in size,in very good condition. It shows age discoloration on back only. And has a small triangle shaped craked at left edge that is only visiable from back side. It is an original oil painting. It is also housed in a ceramic egded wooden frame, the ceramic designs are crumbling off due too age. I am looking to sell this painting but have no idea of it's collectors value.