Classic European styled drop cap letter U image. Use it in the original black and white or with a bit of color added.
Unterm Birbaum was published in German, in 1885. The publishers, Stephan Geibel and Co., were from Altenburg. This letter image appears to be a generic print foundry piece where no illustrator or foundry was identified.
This image is copyright free and in the public domain anywhere that extends copyrights 70 years after death or at least 120 years after publication when the original illustrator is unknown.