"Although Garton's book is the first dated printed edition, the work is neither the first edition of Rashi's commentary, nor the first book to be printed in Hebrew. Between 1469 and 1472 three brothers, Obadiah, Menasseh, and Benjamin of Rome, were active as the first Hebrew typographers. Six works are positively known to have come off their press, among which was the first, albeit undated edition of Rashi's commentary. Nonetheless, [in] the 1475 edition Abraham Garton created and employed, for the first time, a typeface based on a Sephardic semicursive hand. It was this same style of typeface that a few years later, when commentary and text were incorporated onto one page, would be used to distinguish Rabbinic commentary from the text proper. Ultimately, this typeface would be known as Rashi script" (Wikipedia article on Abraham Garton, accessed 07-25-2009).
The Incunabula Short Title Catalogue no. is00625180 cites only two incomplete copies: Parma "Pal" (imperfect), and New York, Jewish Theological Seminary of America (2 leaves).