Its content is almost identical to that of the Winchester Psalter, except the latter is written in Latin and Anglo-Norman Old French.
In his book Libri Psalmorum versio antiqua Gallica e cod.
Bodleiana, Francisque Michel does a full transcription of the Psalter, writing the Winchester Psalter variants in the footnotes under the header Cott.
Digital Bodleian estimates the manuscript to be from 1140 to 1150, while the Trésor de langue française informatisé in its etymologies uses 'first half of the 12th century'.
[1][2][3] The Dictionnaire Étymologique de l'Ancien Français gives a date of 'mid-12th century' for both the Oxford and the Winchester Psalter.