And adding to what was said in the last three posts (Apol, NO-ID-EA and Puzzler):
Most archaeological finds are labelled "Germanic", "Keltic", "(Anglo-) Saxon" (since '45 the label 'Germanic' is less popular), while some might as well have been labelled "Frisian".
History, including archaeology are for a part politically relevant as they help create or sustain a national identity, even more so in these times of secularization.
I can't copy the photo's, but in another thread there are finds in the the Römisch-Germanische Museum in Köln of a big 6-spoked wheel (remains) and this was said:
=> In the catalogue of the exhibition it was explained that the Franks in the 4th and 5th century systematically destroyed all 'pagan'symbols, like this wheel. This will surely also have happened with texts that might have been saved until then.
In this museum was also a bowl (dated: first ten years of CE) with the name Horus scratched on it with a 'Fryan' H (although it may also have been meant as an L: Lorus?, because that is sometimes written as a mirrored Greek Lambda), but the photo is not very clear. I hope someone can make a better picture of it some day.
The Greek alphabet has no H, and the Latin one is the same as our capital H.
Typical is that in the explanation this name was not mentioned, while that of another bowl (in normal letters) in the same showcase was.
My point is, that once archaeologists go look for JOL script, they may find more of it.
Many letters that diverge from the classic ancient alphabets as we know them can be found here: http://otharus.tumblr.com/