A US 1847 issue 10c black large die essay on proof paper is up for auction at Robert A Siegel in New York on September 30.
The lot is expected to make around $10,000-15,000.
The auction house comments: "This is the only recorded essay incorporating both the vignette and frame for the 10-cent 1847 issue in private hands.
"An important and historic artifact of the first United States general stamp issue."
Please sign up to our free newsletter to receive exciting news about postage stamp auctions.