Machine Doubling that is.lol Cool find. I haven’t found a MD until now and still searching for that elusive DD.lol
Yeah, the 1989 D has a lot of that stuff. I have about half of a large Coffee-Mate tub full. Many different years and mints, but the 1989 Ds are some of the clearest.
I would say that's more of a DDD - Die Deterioration Doubling issue. A bit different than MD - http://www.error-ref.com/die-deterioration-doubling-incuse/
