It's from the time of Rashi
+ it contains Rashi's commentary
= Rashi probably wrote it:
This is from Kennicott's annual Collation of the Hebrew [Manuscripts] of the Old Testament (1769). Kennicott collated Bible manuscripts for his master work Vetus Testamentum Hebraicum (1776), a critical edition of Tanakh comparing the masoretic and samaritan text, with all the variants he and his researches found in the many manuscripts they looked at.