, the essay is in the early state showing no background shading and retouching of the right frameline and "POSTAGE/REVENUE" tablet. Photo" /> essay 1916 3d. photographic essay in chocolate by De La Rue on glazed paper and affixed to card (88x115mm.), dated<I> "10 April 1916"</I>, the essay is in the early state showing no background shading and retouching of the right frameline and "POSTAGE/REVENUE" tablet. Photo | Christie's