Hi, I collect & sell vintage bags sunglasses etc. I have recently purchased a YSL brief case. This case looks vintage but is in excellent condition all stiching is perfect insides is lovely. There is some tarnish on the brass that is all. I am just wondering how I could find out if it is real or a fake. The case is bordered by brown leather * the insersts on the front and back of the bag are the YSL symbol in brown all over it there is a gold YSL symbol.There are no serial numbers or tags, would they have used them in the 70's?. The case looks like it would be from the late 70's. I have also found YSL vintage shoes in the original box with this case. If any one can let me know approx value also??? They are great items & I would love to know more about them. Thanks Kassy.