On a Spring Day (Haru no hi ni), Shôwa period, dated 1964

Dated 1964 and bearing the title "Haru no hi ni" — "On a spring day" — this print represents Kasamatsu's mature sosaku-hanga period when he worked independently rather than through the Watanabe publishing system. The composition likely depicts a flowering tree, a garden, or a figure in spring light, rendered with the bolder graphic sensibility and more saturated color that characterized his later work. The date locates it in his postwar career, when he was among the most respected printmakers of his generation.