Paleographical facts and codicological observations represent a key in framing the manuscripts of the early italian city statutes: the scripts of notaries and their practices adapted to the structure of the codex made possible to preserve the text of statutes, to use it and to change it. The paper presents from this perspective a phenomenology of selected facts observed in three pisan manuscripts of the first decades of the Trecento, containing the text of the Breve (i.e. the statute) of the Comune. They are the most ancient manuscripts preserved of the Pisan statutes after the manuscript written at the end of the year 1287 during the exceptional governement of Ugolino della Gherardesca and Nino Visconti, which contains both the text of the Breve del Comune and the text of the Breve del Popolo.