The original painting by Rufus Grider is in a “hidden collection” at the New York Historical Society in New York City. The only copy was donated to the Society by Pamela Vittorio who purchased the rights to reproduce the image from the New York Historical Society.
The Oliver Graham 1777 powder horn is in our collection in the Hart House Winthrop Room annex
— Pamela Vittorio is an associate professor at the New School, historian, linguist, professional genealogist and direct descendant of Oliver Graham.