A rare Atmos model with an ornate banded front door. These clocks were made and sold by Le Coultre to high end jewlers. They were often used as presentation pieces celebrating accomplishments in life and/or career. The clock concept was developed by an engineer @ 1930’s. This model used a set of bellows filled with a special chemical which was very sensitive to temperature in terms of the volume it occupied. The variation in chemical volume caused the bellows to expand & contract this action was transmitted to a mainspring using a series of wheels & springs & a chain. Hence if the temperature changed enough and in the right range the clock never needed to be hand wound.
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