What is the oldest book that you own? I don't mean text-wise, because I have texts that are thousands of years old. On another note, what is the oldest book that you have seen?
The oldest that I own would be Funk&Wagnalls Desk Standard Dictionary printed in 1922. Although a book I just picked up today, "Character and the Unconscious" comes in a close second at 1923.
As for originals that I have seen, would be 17th century commentaries. Although I don't remember specifically, I think I did see some from the 16th century as well. The books back then were written on much better paper (actually cloth) and still last. It is 19th century books that have the worst paper. Though, for margins and typesetting, 1920's and 30's take the cake. Wide margins, and clear fonts.
What are your thoughts?