As long as you’re on the first pages, how about looking to see if it’s signed by the author?
Any signed edition, but especially a signed first edition increases the book’s value.
An extraordinary example of this is
A Farewell to Arms
by Ernest Hemingway example: It has the original slipcase, it's signed, and this 1929 edition was l
to 510 copies.
Got one of these? It's worth around $18,000!