Alternatives to alphabet?

[Davidsch]

Made a quick pic which shows some of these letters; rr and r, s and a  on 1 piece of paper.

(You could think the s like a 8 is a stroke-slip, but it isn't, it is actually more like a B later on)

Edit: by the way, I remember Diane wrote about papal correspondence on her blog, did you check there already?

I prefer a direct link...