1981 Fleer error cards

[donmuth]

I was going through my box of 1981 Fleer baseball and found a small group of Don Zimmer cards. All of the cards except one had his name, manager, circle around the Red Sox logo, and border in black ink (pic on right). One however is clearly gray in all of those areas (pic on left). All other aspects of the cards appear to be the same (color front and back, etc.).

I haven't done an exhaustive search through my box of '81 Fleer, but I didn't quickly find other cards with similar gray vs. black on them. Does anyone know if this is an acknowledged error card or common printing defect with '81 Fleer? I know '81 Fleer has a ton of other errors and variations from the 3 print runs, but I haven't found mention of thhis specific one on any of the online error/variation checklist sites that I use from time to time.


Thanks!
Donny