Page fix, blue stitch

It looks like instead of re-attaching a corner of this page, a fresh sheet of parchment was trimmed to fit and stitched in. The ink also seems fresher and less worn than the rest of the page.

Sacramentarium [Sacramentaire d’Echternach].
Source: gallica.bnf.fr
Bibliothèque nationale de France, Département des Manuscrits, Latin 9433, fol. 1331r.