Sorry, I just realized many (most?) readers may have never heard of V-metal.
During World War II, “V-metal” (V for Victory) was used to conserve metals critical to the war effort. With brass in short supply, key blank bows were often made from a more available metal (like pot metal) while the rest of the blank was brass. The two metal pieces were joined in a dovetail and the joint was secured by a V-shaped stamp.