I just added the below entry and image to the 19th century timeline (2nd half) and to the blog post, Serpent & Ophicleide: History and Images.

1865-1916—Netherlands: A painting by artist Willem Constantijn Staring (1847-1916) depicts bandsmen of the 9th Regiment Infantry, including a pair of trombonists and a musician playing a green-colored serpent (see below image; public domain).