For something produced 600 years ago and, presumably, intended for daily use it looks in remarkably good condition. That's vellum for you, I suppose. (Sad that vellum is no longer to be made in this country.) And non-fade ink.
Some words are recognisable, but others look like a series of ems, ens and so on all running together.
We had gone to Wymondham Abbey near where we live in Norfolk to look at a Christmas tree exhibition and discovered that two extensions had been built since our last visit. In one of these modern additions very high quality displays of artefacts from the abbey were available to casual visitors like us.
edited for a small correction