Man playing a horn called a Serpent

Collectie Spaarnestad Fotoarchief, Haarlem - Art Unlimited postcard - postmarked from Finland with Suomi Finland 'bird' stamp in 2007

This is a serpent, but not the normal kind. There were relatively few ever made in this style, and they were made after most serpents had already been replaced with newer models. The guy in the picture is only posing, not actually playing, since it would be impossible to play it with the missing key (you can see the dark open hole).