Depending on who it got bought out by and whether they paid in stock or cash, that might be worth quite a bit of money. E.g. if you bought 100 shares of the predecessor of AT&T in 1910, after splits and dividends, that would be worth a very substantial amount.

Alternately, there is a collectors market for old stock certificates. If there's nothing particularly special about the company or your shares, it probably won't be worth that much, but it might be worth putting on Ebay.

Please post an update when you find out. I'm very curious to see how this turns out.