1 Unmounted mint (UM) â the stamp is unused and appears never to have been mounted. 2  Mint never hinged (MNH) â the same as unmounted mint but with an assertion that the stamp is not a formerly mounted stamp that has been tampered with to remove traces of mounting.
vermilion zone, n the external darkish area of the upper and lower lips, extending from the junction of the lips, with the surrounding facial skin on the exterior to the labial mucosa within the oral cavity.
The human lips (labia oris) is the junction between the outer facial skin and inner buccal mucosa that lines the mouth cavity. The outer layers are largely similar to skin except that the lips has fewer layers. The color of skin is determined by the amount of natural pigment known as melanin.