Very striking woodblock print is by Shiro Kasamatsu. Publisher is Watanabe. It has 6mm round seal on the lower right corner of image. It looks like 6.5mm, please see the last picture. ( 6mm seal is actually measures 5.5 to 6.5mm ) Very strong colors and striking composition.
Paper size: 10 and 1/2 by 15 and 1/4 inches.
Image size: 9 and 3/8 by 14 and 1/4 inches.
Sheet number: N/A
Signed: "Shiro" in lower right of image.
Condition: Outstanding condition.