Authentic Edo period, c.1857 original Japanese erotic art shunga woodblock print picture by Koikawa Shozan (1821-1907).  Shunga picture measures 18.2 cm x 21.4 cm.  Excellent colors and impressions!  Very good condition, aside from cropped white borders.  No backing, aside from a few tiny remnants.  Please refer to photos.
 
A darker shunga woodblock print picture from the Edo Period.  In this shunga scene, a woman struggles desperately on board a boat as one ruffian holds her tightly from behind while his friend assaults her.