The vowel exchange "a" to "o"

[nablator]

Even without an exchange, in Latin manuscripts, some scribes had inconsistent "a" shapes, sometimes close or indistinguishable from "o", very much like the Voynichese "o" when the second stroke is straight or slightly curved to the left.

Random examples from Herzog von Sachsen-Coburg und Gotha - Chart. B 372 [last quarter of the 15th c.]:

   
artis

   
exaltari

In You are not allowed to view links. Register or Login to view. all "o" and all "a" are sharp at the top and the second stroke is straight. Only difference between "o" and "a": the second stroke finishes slightly lower with a "tail" if it's an "a".

   
sol... doch got