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An authenticated Edison letter's value depends on the rarity, condition, and content. Also whether it is typed or holographic, in his own handwriting. His classic "umbrella" signature alone can be worth $500 or more. Letters start closer to $1000 and can be many times that. Ultimately, the final value is determined by what someone is willing to pay

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Q: What is the value of an original letter written and signed by Thomas Edison referencing the development of the telegraph?
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