Doing a little research, it looks quite likely that this gauge would have been installed in a war time aircraft, possibly a Spitfire, Hurricane or a Hawk. Please do your own research on this though.

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Ive not tested it, so listing as parts or not working, it may work though, I just cant guarantee it.

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Naturally some signs of age, but overall very presentable, and original. This example has some damage to one corner as shown in the photos.

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