Here's a link to a papyrus fragment from the De Corona from the first century BCE. You may have to use the enlarging tool to bring it up to full size; once you do it's more or less legible:
Demosthenes, De corona, 167-169. AM 9051 (=P. Oxy. XI 1377), I c. BC
It's from this Princeton website; you can find the citation by clicking on the link and then clicking on "Digital Images of ...