Hello, this item is a group of early twentieth century German architectural and topographical drawings, dated to 1932–1933 and associated with Willy Lange. The sheets show measured plans, projection studies, and terrain contour mappings, including references to Dahlem in Berlin, which aligns with Lange’s professional activity as a landscape architect and planner during that period. The presence of technical annotations, grid systems, and elevation data confirms that these are working or presentation drawings rather than artistic landscape sketches. The embossed paper mark from Schleicher & Schüll further supports a German origin and period consistency, as this was a known supplier of drafting and technical papers.

From a market perspective, works by Willy Lange are collected primarily within niche circles focused on landscape architecture, German modernist planning, and historical design archives. While he is recognized in academic and architectural contexts, his works do not command the same market demand as fine art drawings by major modernist artists. Groups of original architectural drawings from this period typically hold modest but stable value, especially when signed and clearly dated. Considering the condition, the presence of multiple sheets, and the partial signatures, a realistic fair market value for the group is $400 to $700 USD.