Origin of the Shield Shape in the Solar Folio of the f85-86 Foldout

[Dobri]

For the V especially, it is possible to find good matches: You are not allowed to view links. Register or Login to view.

One of the things that would supposedly set Beneventan apart is the use of the 3-shape for an omitted m/n, but like Nablator says, these are pretty universal.
Some letterforms are unique to Beneventan, but I don't see them offering any additional explanations.

If it is pretty universal, please provide an example of the use of sideways (flying) letter 'm' in a non-Beneventan script.