Konrad Kyeser's Bellifortis

[ReneZ]

So that was useful because it led me to Keyser's ciphering..So it wasn't just Fontana doing this at the time. 

These appear to be scans 333 and 335 in the provided link: You are not allowed to view links. Register or Login to view.

At first sight this reminds me of Hebrew, but I am also reminded of a cipher that was discussed by Nick Pelling (IIRC) ages ago.

In any case, the characters are very different from Fontana's and also from the contemporary cipher in Pal.Germ. 597.