Precision altimeter - Paulin, Stockholm

Back in the Royal Geographical Society today for a 'Porters Progress' lecture by Leo Holding about about his awesome trek with his team across Antarctic trek by kite ski and the climb of Spectre peak - the most southerly rock spire on Earth. 

This though is a picture of a precision aneroid altimeter made by System Paulin of Stockholm. Current altitude in Kensington, London: 150ft - I would suspect it is over-reading just a touch.