f14v f14r - contemporary damage?

[mykiavellian]

Just both sides, for easier comparison. I know nothing about parchment, but to me the surface damage looks a bit as if someone was scraping off something?

I could see that it would be possible, I wish I had more knowledge of what it looked like up close when someone has deliberately scraped text off parchment or vellum. To me it kind of looks more like fibres pulling apart and degrading from age, specifically because the "scrape" would be at a diagonal to the text and doesn't seem to have a ragged edge you might see if you were targeting something for scraping off and didn't care about the condition of it afterward. But I could also see it as wear on a scraped part that over time turned into a softer and larger patch where the fibres were weakened. It could also be that there was something like a stain on it that wasn't a scribal text error and they were trying to scrape that off, which would fit with the idea that this is a lower quality, maybe even off-cut parchment.