The V.D.B. Was only on the reverse for a short time in 1909, then was stopped. Then appeared on the edge of the bust in 1918, and is still there for owner 101 years. It is incuse there (raised in the die and sometimes polished off the die during die polishing. It is part of the design, so it is not forgotten) because it is raised, even
Machine Doubling can make it look doubled. But because of its size, it is often not noticed when missing or MD.