This official German postcard (DE-1093243) shows a "praying angel", a detail of the church in Wetzlar in a very strange purple color... Thanks Christa!
With very interesting stamp!
Wetzlar Cathedral is a large church in the town of Wetzlar. The struction began in 1230 and is still unfinished, since the western front is still missing its northern belfry. Because of its long period of construction, the church combines romanesque, gothic and baroque architecture.