Found it... German notgeld - Bonn n/a 10 Pfennig 1918 iron (large date) There are so many different Notgeld, I still have some that I can't identify.
That is the "Old Bridge" across the Rhine. It connected Bonn (back then on the left bank of the Rhine river) and Beuel (right bank, today part of Bonn). That bridge was considered to be one of the most beautiful bridges in the Rhine valley, maybe not so much because of its architecture but because of the scenery. Christian