A gentleman sent me these photos of a device he has had for some time. He would like to know what it is.
It looks like a drift sight to me that is missing the base and/or recorder.
The serial number looks like classic Air Ministry to me with a 1940 date at the end.
Do you have any idea exactly what it might be? Inquiring minds want to know...

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Taigh Ramey
Vintage Aircraft, Stockton, California
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