Re: BEAU/F data plate?
Steve. This looks like a final inspection plate; assemblies and components were marked at the factory either by an Aeronautical Inspection Department (AID) official or a company inspector under AID authority. A metal stamp was used for identification of the Inspector with his registration number and (usually) a rubber inked one for other data. This is probably a small part rather than a major panel but all had to be signed-off.
Nick
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