I’ve written the text for two highway historical markers for African American cemeteries in Virginia: the Mt. Calvary Cemetery Complex (est. 1879), Portsmouth, in 2016, and Oak Lawn Cemetery (est. 1885), Suffolk, in 2019. However, I never knew how they were made. Thanks to a wonderful story about the manufacturer, Sewah Studios (Marietta, Ohio), I know the answer. The historical marker for Oak Lawn Cemetery is shown briefly in this great video courtesy of WTAP News, Parkersburg, West Virginia.