Depending on where it was purchased and what kind of sale. Most dated furniture is placed by previous owner, maker or restorer. Of course it could have also been placed by someone 'salting' it into a auction to try and up the bid or other unscrupulous reasons.
If turn of the century (20th), it's more than likely pencil and not felt tip or ball point.
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best............... Tim
"The taxpayer: That's someone who works for the federal government but doesn't have to take the civil service examination." - Ronald Reagan