It proves that Oswald sent Klein's $21.45 for a rifle, and it proves Klein's sent LHO the C2766 rifle.
It proves nothing of the kind. It’s an order blank printed from microfilm that is now “missing”. It doesn’t prove that anything was sent anywhere.
But keep pretending that all the Klein's paperwork is fake. After all, it's the only hope you've got.
Sorry, I didn’t claim anything was fake.
But you keep pretending that unscientific and biased handwriting “analysis” of two block letters on a photograph of a microfilm copy of a 2-inch order blank proves a damn thing.