One of @6 pairs of original tablets created for the 1956 Cecil B. DeMille classic, The Ten Commandments.
All of the tablets were painted by Paramount Pictures Scenic Artist, A.J. Ciraolo, (which I had verified by the DeMille family). After production, the Ciraolo family kept 3 pairs. This is one of them, and was most likely used in the long shot of Charlton Heston you see above.