A nice auction story behind this pencil page page: Heritage first offered this page as "Neal Adams Green Arrow Unpublished Page Original Art". This made some fuss on the comicart-l and on Neal Adams Almanack Facebook group (https://www.facebook.com/groups/326921490741151/permalink/396419090458057/).
Rich Buckler identified it as his work in the context of the Facebook-conversation:
"That page is not Neal Adams. It is definitely a comics page penciled by me. Thanks for the sideways compliment 'Neal copy cat'. But, too detailed to be me? I was working this detailed since my first pencil work at D.C. Comics ('The Symbionts', which Neal inked). I have no idea what this page was for and why it was not used. I'm wondering why Heritage did not contact Neal to authenticate this piece."
Then Heritage took it down and offered it a few weeks later as "Original Comic Art
Rich Buckler Green Arrow and Black Canary Pencil Panel Page Original Art (c. 1970s)".