Originally Posted by
Hyacinth 
It's earlier than I'm familiar with. Can I ask why you feel it's a Cashin bag and not just an early Coach? Have you had any similar styles authenticated by the Cashin Foundation?
And is your buyer questioning that it's a Coach, or that it's a Cashin design, and did they give you any reasons?
Hopefully either DemRam or Denimbarks will take a look.
Oooooh Brother.
I REALLY wish that buyers of older and vintage Coaches would have to pass some sort of test before they're even allowed to bid on anything more than 2 years old. AND that I could wave a magic wand and make 95 percent of the "authenticity guides" on the internet disappear forever.
For starters - please never use the term "Cashin bag" or "Cashin-era" unless you've verified that Bonnie Cashin actually designed the bag and it was made while she worked at Coach. It's NOT a blanket term for vintage Coaches, although hundreds of sellers seem to use it as such. There's a very specific time period and specific design details involved and there's no proof your bag has either.
Second, tell the buyer who can't be bothered to do a little research about older Coaches to read every single one of Salearea's Coach Guides posted at Ebay, ESPECIALLY the ones about creeds, serial numbers and classic and vintage bags:
http://search.reviews.ebay.com/members/salearea_W0QQcpnameZmembersQQprZsaleareaQQuqtZg
If she still has questions after that she can come here and ask instead of believing the nonsense and outright lies found posted all over the Internet.
As for your bag, I haven't seen it before either, but my experience with Coach doesn't go back to 1960 and I'm sure there are plenty of older Coaches I've never seen. We'd probably need a lot more photos and even then would only be able to guess, since that little metal plaque is probably pretty easy to switch from a Coach to a non-Coach. I'll bow to the opinions of the other posters I mentioned before when it comes to true vintage Coach.