Rare WW2 German Kriegsmarine Barograph, I am told it was used used for measuring air pressure. Mahogany cased which is hinged to gain access for changing the paper graph rolls. Key operated. Kriegsmarine brass label to the top with a issue number of 349/OBS. There is a makers mark which is very small and hardly legible and could possibly read Luft or Luift.
There seldom comes onto the market Kriegsmarine instruments or technical items. Normal Barographs fetch $1000 so this one is a good buy at under $1000