A good match, perhaps from the Zürich area...

[MarcoP]

I am not sure it makes any sense, but that 'e' in valsen looks to me like it could be e^ or c^ with an r-abbreviation curl (a shape similar to s). There's a stain there, so the thing is highly dubious. If 8 stands for short-s, like in the Zurich ms, they could be two words "vals e[...r...]n" "vals c[...r...]n".

(an example from Cappelli, and what I think could be "obstupescere" from Zurich 3v)