Authentic Edo period original, c.1850, Japanese shunga erotic art woodblock print picture book by KUNIMORI II Utagawa (active fom 1848 - 1860).  Shunga book measures 12 cm x 18 cm closed.  Very good colors and impressions.  Condition is decent+/good with some wear and soiling, few burn marks on some pictures, original binding string has been replaced.  There are 12 total picture pages inside.  The remaining pages are kanji text pages.  Please see and judge from photos. 
 
Nice Japanese shunga erotic artwork throughout the book with some very odd, rare scenes.  Enclosed is the fisherman having intercourse with a stingray, as well as another picture showing a man with a Noh mask (or Tengu) penetrating his female lover with the nose of it.