A case in point is the British brand Vauxhall (Wikipedia entry here). Before 1910, Vauxhall came up with the idea of placing tapered, concave depressions on each side of the hood where it transitions from horizontal to vertical. Visually, these seem to be scooped out from the hood mass. British car styling being conservative and World War 2 having dealt a serious blow to the economy, Vauxhall cars didn't receive fully envelope-styled bodies until the early 1950s. Nevertheless, these concave streaks continued on Vauxhalls until the 1957 model year began their disappearance.
These Vauxhalls are from the era when exterior components were separate units. The tapered depression is clearly seen on the 1920 and 1927 vehicles.
By the mid to late 1930s, Vauxhall bodies were becoming increasingly rounded, yet stylists still had no difficulty incorporating the traditional hood accents.
Vauxhall's first post-war body retained a tall hood that could support the accents (which were embellished by chrome plating). But there was now a disconnect with the grille which was horizontal and low.
Another complete body restyling appeared in the mid-50s, the transition to the envelope type being completed. The hood was now lowered, leaving less room for the accents. Another complete restyling came in the form of the 1957 Vauxhall Victor whose hood was lower than the fender tops. There being no place for the accents, they finally disappeared.