Antique Wittnauer Longines Victorian Style Barometer Weather Rare No Key For Sale

This is a vintage Wittnauer Longines barometer weather instrument designed in a Victorian style. It is a rare collectible item that was not modified and is in used condition. The instrument is a barometer used to measure atmospheric pressure and predict weather changes. It also has a hygrometer to measure humidity levels. The product is a unique piece of scientific instrument history that would make a great addition to any collection. I think it needs to be wound by a key, so I am unsure of its function