validity of 100 shares, each share number, dated october 18, 1955; signed, everywhere, with florida 1951 seal.

Question

In 2005, I purchased each share (100 shares per certificate) for 25cents a paper, at the Del Mar County Faire, Del Mar, CA and I have no idea if they are valid or not and there is a name on them; however, why would they become a "sale" item, perhaps person died and if so can I cash them at a later time, since I bought them I will definitely keep them. Thank you for your research and replies.
The Seal says: shawano development corporation; inside, corporate seal 1951 florida.

Answer 1

At a guess, the company is no longer in business, so they wouldn't be worth anything. There wouldn't be anyplace to "cash them".