The lid is located next to the old jewelry store Büker - a store that has been around since 1904.
The city of Dortmund uses manhole covers to mark very old businesses, or important historical events and buildings.
The name R.DANNHÄUSER probably indicates the advertising/design company responsible for this advertisement
PASSAVANT is a name used by the manufacturer ACO. To specify products related to drainage systems.
See a cover in another city in Germany, where something similar is done
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And also in the same city
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Photographer’s Note: Dortmund has a number of manholes in their city centre, which are actually adverts for local businesses. In this case it is the jeweller Rüschenbeck.