When I was in college, my husband and I loved going to second-hand bookstores in Harvard Square. One day, we found a book from the 1600s. It was a Latin/Greek lexicon printed in Amsterdam, and it cost $175. With most antiques, if something is from 1850, it’s considered really old. If we had found a painting from the 1600s, it seemed to me that it would be worth a lot more than that! So we bought the book.