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Authentic Meiji period, c.1905 Japanese erotic art shunga copperplate print picture by Takeuchi Keishu (1861-1942).  Shunga picture measures approximately 20 cm x 13 cm.  Very good impressions.  Good condition with some wear, soiling, bit of creasing.  Please refer to photos.
 
A great shunga piece detailing the differences between the 'ideal-looking' vagina at the upper left to the inferior ones on the right.  Each picture is even denoted a specific name (kanji in the adjacent column) regarding its type (from "virgin" to "slut" - don't shoot the messenger! - and everything in between).   An actual poem is written below the 'perfect one' on the left.
 
About copperplate printing in Japan:  Copperplate printing gained popularity in Japan during the late 19th century and into the early 20th century, particularly in the Meiji period (1868-1912).  It was introduced from the West and used for its ability to capture fine details, which woodblock printing couldn't achieve as easily.  By the early 1900s, copperplate was commonly used alongside traditional woodblock methods, especially for detailed reproductions. This shunga picture, likely from 1905-1910, reflects this transition in Japanese printing techniques.