Wohnhaus in Flamersheim is listed in the "Liste der Baudenkmäler in Euskirchen":
(
visit link)
Informations from there: Wohnhaus, Flamersheim, Pützgasse 1, 1753
Some but not all official monument buildings in germany have a little sign with the word "Denkmal" and the coat of arms of the federal state on it.
In this case the sign is mounted at the right side of the door.
The year when this house was build you can find above the doorway.
The numbers are made of iron.