Do you have an old BB gun at your home? Maybe one of your family heirlooms is an older BB gun. The Daisy BB Gun company provides information about old BB guns for owners.
Daisy has been around since around since the 1880's, though it didn't start as a BB gun factory, they started out making windmills and decided to diversify. The Plymouth Iron Windmill Company later became known for their Daisy BB gun. You can read more about the gun and the company that makes it at their history page at http://daisy.com/history.html.
Do you have an old Daisy? Maybe, like Ralphie in A Christmas Story, you received a Red Rider BB gun as a present. Your grandfather may have even owned a Daisy. You can actually find out more about an old Daisy BB Gun, including it's age by writing to the Daisy Museum. For the address and the form to send to Daisy see http://www.daisymuseum.com/html/antiquegunform.htm.
BB guns can be fun-but be careful, don't shoot your eye out;)