The lid is located next to the old furniture store Büker - a store that has been around since 1882. Another cover indicating this store is also found at the site
The city of Dortmund uses manhole covers to mark very old businesses, or important historical events and buildings.
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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BEGU is a combination of concrete and metal in the lid used by the ACO manufacturer
Photographer’s Note: Dortmund has a number of manholes in their city centre, which are actually adverts for local businesses. This one features a wind rose and is advertising bücker, a furniture shop.