WW1 Zenith MARK V aircraft cockpit watch...

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These were used by the Royal Flying Corps (pre-RAF) from 1916 and were held on aircraft instrument panels in metal or rubber holders....

 

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Cool! Are the holders hard to find?

 

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Cool! Are the holders hard to find?

There's one on ebay with a watch (not a Zenith), that's all I've seen so far.