NOS 69-72 RH front fender - how do I tell?

[CC69Rat]

I bought a 69-72 RH front fender today. The story is it was found in a body shop, it was in the rafters for years (since the early 90s) I have pieces of what I THINK is the original GM sticker off of it. Does anyone know the part number for. 69-72 RH?

The guy I bought it from says he thought it was NOS but was not sure. I rolled the dice on it...

It feels really solid and heavy like a GM fender would.. I have had repro before and comparing to my GM 68 fenders they look and feel about the same.

I bought it to re-sell it. How can I prove its NOS? I just dont want to misrepresent it.. but I dont want to give it away. Is there a tell tale sign of a GM fender? Thanks.
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