Coach Bonnie Cashin handbags

[marg2001]

How do I authenticate whether these are real Coach/Bonnie Cashin from the 60’s? I’ve seen several online that are similar but most have the striped lining. They are from a collection from an old (deceased) fashionista friend. 
Both are heavy leather and have the wear -and-tear of

 

 

 

 

 

 

 

 

a 60 yr old purse!

the brown leather has the coach label while the red only has the Bonnie Cashin label. 

[albertabrightalberta]

I'm not a BC expert, but I don't see any problems with either bag. Whether they're Bonnie Cashin or Cashin or Coach, I don't know.

Note that Bonnie Cashin made bags with her own label but she also made bags, clothing, accessories and styles for other companies, including Coach, Meyers and Ballantyne of Peebles. 

[sandimas]

Both are authentic double kisslock purses. One is by Bonnie Cashin and the other is influenced by Bonnie Cashin by Coach.

[sandimas]

the Bonnie Cashin was called a 'Double Header'. double header was made between 67-70.
That cotton lining in it indicates it’s from around 1967/68
The lining (that plain light color) is referred to as “natural” and is Italian spun cotton

[marg2001]

Is there any type of company that would give an official authentication  letter? My biggest concern is representing it incorrectly. 

[marg2001]

Ty so much! I’m happy they are real and appreciate you looking at them. Do you know if there is a company that would provide something official for selling purposes?