Maybe it is a "B" after all.

See this post https://parkerguns.org/forums/showthread.php?t=37635

The controversial interpretation of the "B" vs. the "8" gives rise to Jimi Hendrix' "If Six were Nine" playing in the background. "Limited Editions" take on an ethereal concept if the number of 'editions' is more than 4 IMHO. We know where 3 of the Parker Invincibles are and some of us think we know where the 4th one is, but beyond that I think I hear Joy Behar braying in the background, "SO WHAT!? WHO CARES!!??

I saw one listed on a dealer website that I believe was numbered 10 of 100, and there was no ambiguity in the engraving. Especially that this was the first of the series, I would guess that this was one of a set as surmised. But as stated above "who cares?" Most of these specials suffer from the same problem. They often cut corners to hit a price point and try to sell rarity. I think the barrel engraving related to the theme is pretty hokey looking.