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Good day all, I have another similar posting, but this is directed at the Authentication company's out there.  Can anyone tell me if a single letter could possibly authenticated?  It's possible this is an approval or "sign-off' Mark made by Thomas Edison on an early apparatus used in  the silent film industry.  And is there someone out there that may specialize in Thomas Edison or at least id familiar with his differing marks?

Thank you in advance,

Rich