Rare complete and boxed Draeger bakelite gas detection device

Rare bakelite gas detection device or Gasanzeiger. Extremely scarce to find complete with all of its period contents. The wooden box is in good condition with original paint, carrying sling and working closing latch. Inside the lid is a indicating chart for gas detection. The gas detection device is in good (in my opinion) working condition, and the sleeve for the cartridges is also in good condition complete with the original bakelite insert. The glass spent cartridge container is also still inside the box as is the tool for removing the spent cartridges. Extremely scarce to find a Gasanzeiger in good condition, especially complete!