Abbreviations, anyone?

[Helmut Winkler]

Of course there are, only you make the same mistake most people make, you read annum, you could read avium/auium as well, the best example is the famous daiin, which really is d' aui. And I think it is rather around 1400

Edit: The additional minim in your annum example doed not matter, it is the problem of reading a Textura