] This listing on e-Bay caught my attention. Could this be for real?

This seller is obviously taking a chance.
He presents no proof of authenticity at all. It's a joke, if it's not criminal! And even if it had been genuine,it's not very interesting.
Who would pay a lot of money for such a small cut out piece of her writing,without her signature? And besides,didn't Jane usually write the word Mrs with a character looking like an f?

Leif G-n