Vintage Sonola accordion from the 60s with case. Collector piece! Excellent cond

Description

Beautiful instrument and collector piece!
It belonged to my Italian mother, who was born and lived in Torino her whole life.
I need to let it go now, even if it's hard to separate from it.
I am not an expert in the field, so i contacted Sonola to find out which model this is and the value. I have been told it is custom made and it is unique. Whether there is only one of this out there or it is one of a very limited number.
This is a piece for a collector. And for a musician.
It is in great condition for its age. It wasn't used much... There is only a small repair done some time ago (the last key of the keyboard), it doesn't have any impact on its proper functioning and the sound.
Sonola said I don't need to describe it, a connoisseur would know instantly what it is.
It has its own vintage hard case. The leather straps are also in great condition.
I will send you more pictures if you are interested.
Thanks for your interest