My favorite Blackmoor is...

[Havard]

Yep. Basically what Havard said. Although to quibble, I do think there is more than enough campaign setting material in FFC. It is true that its not detailed "in the modern sense"

I expected some reaction to my comment on the FFC. The main problem with regarding this product as a basis for a campaign setting is that it's not a setting product. It is instead a description of an actual campaign and how it played out. The focus is on what happened, and only to a lesser degree on the basis for the campaign, which is what later setting proucts were like.

Blackmoor is fairly unique in this sense, that it has details on how the creator played the campaign, not just the setting itself.

If you insist on using M-Blackmoor etc. labels then I suppose
original Blackmoor would be O-Blackmoor. But personally I think those kind of abbreviations are too common and confusing.

I tend to agree. It mainly makes sense with regards to Greyhawk, since Greyhawk's Blackmoor is significantly different from Arneson's.

Havard