Thank you!! You just gave me some food for thought.
I promised her that I will ask here in APF about the seller, as I never heard about him. I already directed her to HA and gave her my HA catalogue. She is thinking about it.
I agree with what you say about the look of this poster. From our conversation, she thinks it is rare and this might be her only chance. Not sure if she is right as HA sold one few months ago? She knows the restorer of this poster, she likes his work and that is a plus for her. So...will see.