It was written by Miriam bas Yaakov, probably a widow, declaring to her brother-in-law, a brother of her former husband Shaul, that she received all the money promised in her kesubah.The document is still in the process of being authenticated. The end of the article (Joe says it's five more paragraphs) is only available in the print edition.
Dr. Chagai Misgav, of Hebrew University, told Hamodia that details in the document reveal much about the way Jews wrote documents in those times. It is dated for Kislev, arba lechurban Yisrael, year four to the destruction of Israel, which Misgav says means the churban of the second Beis Hamikdash.
"This is interesting, since in all other documents written at that time, the year is dated to the rule of the Roman Caesar at the time," says Misgav. "However, since this is not a regular document but a receipt, they didn't write it according to the regular customs but instead wrote the date according to the churban Beis Hamikdash."
Indeed, the Rambam in hilchos Gerushin writes that in those days they would usually write the date on a get according to the years of the king, although there were some who had the custom to refer to the number of years since the churban Beis Hamikdash.
Amir Ganor, director of the Unit for the Prevention of Antiquities Theft in the Israel Antiquities Authority (IAA), believes that four years after churban Yisrael alludes to the fall of Bar Kochba.
"Since we don't have any other evidence of the Jews dating after the churban Beis Hamikdash yet we have found coins and other evidence of them counting to the years of the Bar Kochba rebellion, this document may be dated to four years after the fall of Bar Kochba," Ganor told Hamodia.
Background here.