H.G. Peter's first sketch of Wonder Woman, recently recovered from his estate, is now up for sale. Peter was the original artist for the character when she got her start in William Moulton Marston's December 1941 All Star Comics #8. What makes the artwork more interesting (and likely more valuable) are the notes between Peter and Marston underneath it.
Read the text of their notes, more details about the item and see another photo at the sale listing at ComicLink.