This is an Elliot Brothers compensated pocket barometer / altimeter. It is graduated from 0 to 8000 feet and 23 to 31 bar. The cover glass ritates and there is a fine line to measure change. The needle does appear vary from day to day, but I suspect it will need to be recalibrated in some way and also restored.
It is 1 3/4 inches (46 mm) in diameter
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