Month names collection / metastudy

[Koen G]

I based the list off the headings of the journal, where may is written with the diacritic. However, in the main text i.e. "on the 10th of may, 10 sacks of grain to [...]" may is written without the diacritic, which I think is interesting in itself. The diacritic may is on folio 22r

At first glance, it looks like a blocked "dot" on the left stroke of "y", but the writer doesn't use this anywhere else. And he dots his i's with a long, hardly perceivable line.