Here are some images of the 13th century Torah scroll currently on auction at Sotheby's (expected to sell for $500,000).
These images are from a powerpoint presentation (download as a pdf) which expands upon the unique features of this scroll, including illustrations of later scribal emendations apparently made to bring this scroll in line with later scribal traditions. An actual 700 year old sefer Torah, it also seems like a nice illustration of why archaeology is not normally welcomed in halachic discussions.