Note the devices on UNITED are wider/shorter than the STATES OF AMERICA? That is because the incuse devices on the die were partially filled with grease in that area. The devices are tapered at the top so when the device is blocked by grease, it prevents the thinner part (the tops of the devices) to be formed. Leaving them shorter and wider than the normal devices.

If the devices were not tapered, then they would not release off the die after the strike.

























