I have a copper plate engraved with the “Warren” painted by Charles Hancock and original engraving by R. Parr. It’s 8.5” x 11”. It’s not a reversed image so I know it’s not a printing plate, just a display piece. There’s no date or other markings, so I can’t image it being from the period since it’s more of a traditional modern size. But there’s so little information about prices of copper engraving.