All MS images of swallowtail merlons north of Italy we know of are Weltchronik

[Koen G]

And there's this, Vienna, 1330-1340. But what is it? Merlons with windows??

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That one's interesting, from about the same time as the Zurich MS and in a similar style. These merlons have a very shallow indentations and curved lines. I wonder if these two are something else altogether, some parallel evolution that doesn't have much to do with the Italian architecture. On the other hand, Ghibelline merlons often are curved like this, so I'd assume they're referring to the same thing.