Vintage bag or purse

Received as a gift some years ago. I am not sure of authenticity and maybe someone on this forum can advise me. I have only used a couple of times. Broken zipper but the original zipper is inside the bag. I cannot find any brand markings inside, but its very well designed. A small paint mark on underneath, I did not want to put anything on it to cause greater damage. I found a look alike to research and reach my price. Make me an offer!!!!