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This essay is a contribution to research into the art market of the painter Max Slevogt. It identifies and locates works by Slevogt that were offered and sold at Hugo Helbing’s auction house in Munich between 1905 and 1935. The focus of the study is the 1927 Helbing auction of the collection of the Breslau entrepreneur Leo Lewin, from whose holdings 36 works by Slevogt were offered and sold. Numerous early provenances of works by Slevogt can be revealed on the basis of the auction house’s so-called protocol catalogues.