IamBrook wrote:
Dark Speedster wrote:
Masterwork Milestones were:
#1 Spider-Man (Classic Hero)
#50 Captain Marvel (Cosmic Hero)
#100 Defenders (Team)
#150 Marvel Team-Up (Team Up)  
Interesting observation - of course this leaves us with, what could possibly come after the Team-Up. Based upon "paterns"?  
Prior to Spectacular Spider-Man, were there any other Marvel characters who had two on-going monthly solo books? If not, that might be a milestone to be recognized, although I would expect that to be Volume 250.

For Volume 200 milestones, loosening of the comic code and the reappearance of monsters? First on-going Black super-hero monthly? Fusion of super-heroes and horror in Ghost Rider? All good possibilities, but I still like Marvel Two-In-One for the honour as the timing seems right and that series had a longer run.