"Life is like a box of chocolates, you never know what you're gonna get." - Forrest Gump The light shall never be engulfed by the flames of darkness. Even though night may devour, brightness shines, never defeated. Enjoy the simplicities of life.
Looks like while they were polishing the die, the field was reduced on that are, so all coins will show that rise on that area. When the fields are polished again, it may remove the field enough that it won't be seen on the struck coins. Just a die event. Not a premium for the coin.