Authentic Edo period original, 1824, Japanese erotic art shunga woodblock print picture by Utagawa Kunitora (active in the early 19th C. and one of Toyokuni's top pupils).  From his shunga series, Senrikyu.  Shunga picture measures 22 cm x 15.3 cm.  Very good colors and impressions!  Condition is decent+ with some wear and soiling, wormage.  Please see and judge from photos. 
 
An interesting antique shunga erotic art picture depicting a penis-measuring contest of sorts.  A couple of participants sit down passively with their erections waiting to be judged by an older gentleman taking notes of the participants' manhood.