Bergleute hatten in den 1950-1960 in diesen Henkelmännern ihr Essen dabei .
Miners in the coal had in the 1950 and 1960 years their lunch in such containers here
Die Anleitung stammt aus dem Buch : Häkel dir dein Revier
The pattern is a book that contains many Miners utensils and typical things from “Ruhrgebiet”