Made in England · stamp F+W 59
Smiths «Desynn» system indicator, Made in England — with the F+W 59 inspection stamp of the Swiss Federal Aircraft Factory Emmen (1959). Swiss Air Force use, Vampire/Venom era.
The Desynn system transmits readings electrically from sensor to display — flap position, trim or pressure, for example. This indicator is the cockpit end of that chain.
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