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RichardBruce mentions 20 people who are willing to spend 20k on a "19th century item."
I don't know if that is accurate or not, but I think that if the question were rephrased as "any time period item" rather than "19th century item," Bruce's estimate would be higher.
I am sure we all agree that the number of people who are willing to spend 20k on a 20th century item is far, far greater than 20.