Keep in mind that die wear always moves on these single squeeze dies towards the closest rims. That is what you are seeing the beginning of DDD. On the reverse there is slight Machine Doubling on the 'FG' on the initials. But DDD is seen towards the rims on the tops of some devices on the fields. DDD is an aging process that moves in stages. Your coin is in the first, moving into the second stage.
Just a common aging event of the dies and post strike damage on some of the devices with Machine Doubling.