it's very old school. You see it more commonly as "op. cit." and often followed by the first footnote it was used in (i.e. first-reference-note-number in CSL). It's pretty much non-existent in English apart from some law styles, but does come up in Germany & Southern Europe.
Upgrade Storage
Can you test this style?
Right click and save as. Then install via a double click or via Zotero's menu.
https://github.com/POBrien333/styles/raw/a7f5349b6d8fa975a68bd0886ffed90141ce74b9/mimesis-edizioni.csl
thank you so much!
you spared me so much work!