Authentic Edo period original, c.1850, Japanese erotic art surimono (privately commissioned, high-quality print) shunga woodblock print picture by an artist of the UTAGAWA School.  Shunga picture measures 8.5 cm x 11.5 cm.  Very good colors, impressions, and embossing.  Good condition with some mild wear.  Album backing.  Please see and judge from photos.
 
An interesting & comical surimono shunga picture of a voyeur creeping closer and closer upon a couple mid-coitus.  With his hand on his head he's apparently perplexed at how the other guy can pull it off, while he can't.  Free tip to our voyeur friend:  For starters, you have to stop doing what you're doing right now!