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A JAEGER LECOULTRE ATMOS CLOCK CIRCA 1970s White dial with applied Roman numerals, outer minute track, 4 sided brass case with 5 glass panels, dimensions are approx 22.5cm/19.5cm/15.2cm. The clock gets energy from minute temperature and pressure variations in the atmosphere and a change of just 1 degree Celsius between the range of 15 to 30 degrees is enough to power the clock for 2 days. Designed for minimal power consumption, wear and resistance its heart beats just twice per minute, 60 times less than a conventional clock and 240 times less than a wristwatch movement.