That's why we join! May the engineer in you be happy as kids in a toy store; SurplusRecord, Sterling Machinery, Rohner, Williams in the US and what turns up in Europe. You might look at 100 files or 1000; but certain yours is not the only one. One more detail to try is some clue whether shes Euro or Asian, eliminating or at least narrowing the field. I will say those shifters on the headstock seem familiar.
I suspect Comesa might be a brand, not the actual maker. That is very common. An Italian member here named ''rendoman'', might be worth your time email wise.
I'm currently hampered being English language only, in common speech and the gigantic vocabulary of the metal trades; the translation feature in these pages operates by interpretive manner, but likely hasn't 'learned' our vocabulary 100%.