There were two versions. One featured multiple players from each set as a collectible card, and the other also featured multiple images, but had a space on the back for your name and address, where you could send in into Topps and receive all the single players from that particular Black Gold set.
Herschel Walker was in the D, CD, and ABCD groups. Shown below is the CD non redeemable version:
You'll see that Herschel is the last player shown on the front of the card, and is last to be named on the back.
Interestingly, the AB card is an UER, or uncorrected error card. That is because Walker is not shown on that card, yet his name is on the back, under #17. The player that should have been named is Ricky Watters, who also played for the Philadelphia Eagles at that time.
Here is that card:
I'm glad to add these cards to the Herschel Hoard, and someday hope to add the D and ABCD card as well.