Large antique altimeter, poss military observation balloon.
The altimeter measures 69mm diameter excluding the stem and the loop, so larger than the standard 50mm size.
It is believed that an altimeter of this size would have been used aboard an observation balloon during the first World War… the observer would have worn thick gloves so a larger altimeter would have been easier to handle.
Identical altimeters were manufactured by Thomas Watson Scientific Instruments Ltd, a London based optical and scientific instrument manufacturer and this is probably one of their pieces.
The altimeter is functioning although has not been tested for accuracy.
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All of our watches are checked over before listing, and are also checked for accuracy which is usually within around +/- two to three minutes over 24 hours (unless otherwise stated), which is considered resp
...ectable for a vintage watch.
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Antique ID Number (AIDN): SA1195095
Dateline of this antique is 1910
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