Soprani Accordion Identification Requested

I got another letter from what appears to be a Paolo Soprani Accordion owner.

Lisa Writes:

Hi. My husband bought this accordion at a garage sale awhile back. I know nothing about accordions and can’t seem to figure out the value of this accordion or date of manufacture. It has what I believe is the original case with it. It just says “Acona Due” and “Sporani” on it. I apologize if this is a pedestrian one for you and easily identifiable, I just can’t seem to figure it out. Also the # 16570 is written on it in pencil. Don’t know if this means anything, but thought I should add that.

If you can identify the age, value and any other information about this Paolo Soprani Accordion, please leave your comments below.

Thank you.