Walther & Co. “Stabil” Metallbaukasten No. 50 – Early Engineering Construction Set (Germany) Approx. date: c. 1911–1920s (early production period, pre-war era) Rare and early German engineering construction set manufactured by Walther & Co., Berlin, part of the historic Stabil Metallbaukasten system designed for educational engineering and mechanical assembly. The set comes in its original wooden box with hinged compartments, showing period construction with hand-fitted joints and metal hardware. The lid features an original lithographed illustration depicting children engaged in engineering and construction activities (bridges, cranes, railway infrastructure), typical of early 20th-century technical educational toys. Condition: Complete set in good antique condition, showing authentic age-related wear. The wooden box displays patina and signs of long-term storage. Metal components are present and consistent with full original configuration. Contents: * Complete original metal construction parts * Assembly tools (keys / fittings) * Period handwritten inventory/instruction sheet (contemporary handwritten note, likely original user documentation) * Original wooden storage box with internal compartments Notes: This example represents an early production version of the Stabil system. The handwritten content list and construction style of the wooden box suggest an early manufacturing period, likely 1910s–early 1920s. A highly collectible piece of early German engineering and educational toy history.