Authentic Edo period original, c.1840, Japanese erotic art surimono (privately commissioned, high-quality print) shunga woodblock print picture by an artist of the UTAGAWA School.  Shunga picture measures 9.5 cm x 12.7 cm.  Very good colors and impressions.  Very good condition with some light wear and soiling.  No backing.  Please see and judge from photos.
 
A colorful original surimono shunga woodblock print picture of an erect male bragging about his manhood, while his female partner looks on inquisitively with a measuring stick.