I have a fossilised twig. I found it on the beach inside a flint nodule.
A set of two dictionaries dated 1850.
I was going to say some some dageurreotype photos that belonged to my grandfather but thinking again it's probably an Indian arrowhead found on the creek of our farm in the late 1950's, it was probably a century or more old when it was found.
Probably my house itself - it's over 80 years old. Then it would be my grandparents' coffee table from the 1940's
An old Bible that was given to me when I left home at 17...the bible is dated 1837.