The flag comes from one of the oldest workers’ associations in the Ruhr area. The “Bergmann-Verein Überruhr”, founded in 1861, became the “Katholischer Arbeiter- und Knappen-Verein” and then the “Katholische Arbeitnehmer-Bewegung”, which dissolved in 2011. The flag was made for the 40th anniversary of the foundation in 1901 and restored in 1986. The profound religiosity becomes clear in the motif of the praying miner.