accordion info

[exit55]

Looking for a web site or info about accordions. There is a Devinci accordion coming up for sale at an estate.  Sorry I didn't make a picture of it.  I looks like the red one listed on ebay (https://www.ebay.com/itm/DA-VINCI-L-M-120-ACCORDION-RED-KEYS-ACCORDIAN-WITH-CASE/232753449819?hash=i...  

Where is the model No. located?

What is the value on Ebay?  Can't find any completed auctions on one like this.

If I can't find the model No., what is the difference between a regular model and a professional model.

And help will be appreciated.

[maxine*j]

There is a ton of info, even vidoes, on Da Vinci accordians, their history, their values, and more:

https://www.google.com/search?source=hp&ei=LnLwWtyDJu-L_QbHyo2YCA&q=da+vinci+accordion&oq=da+vinci+a...

And on buying and selling accordians, in general, such as:
http://www.accordionlinks.com/worth.html