P. Koenen was a Dutch illustrator of the 'Pijpje Drop' comic, published in the 1930s in De Automaat, a weekly magazine of the Petrolea oil company in The Hague that sold petrol from door to door. 'Pijpje Drop' was a little black boy, and his adventures were later collected in at least six books, with a page consisting of one drawing and a text in rhyme. The comic gives a very stereotypical view of black people (the main character is called "Little Stick of Liquorice"), and is set in a strange world with palmtrees and black police officers in British uniforms.
Little is known about the authors of the strip. The writer is only known by his initials (A.S.-D.) and no first name is known of the artist, Koenen. P. Koenen has however also drawn some prints during the 1930s.
Although the artist remains a mystery, the looks of artist Koenen can be seen in above episode of 'Pijpje Drop'.