Not Brand Echh will be the capper to whatever Sixties material is left. The best of the rest is the Severin Sgt Fury. Ka-Zar and Doc Doom in Astonishing Tales are from 1970. NBE puts closure on the Silver Age, with spoofs on Silver Age comic book and cultural relevance. It has to be one volume only (12 issues worth, since one was a reprint) -- Marvel can't take the chance of a dud second volume, plus keeping it to one volume will always make the whole line available to potential buyers who don't have the immediate cash or inclination to pre-order it.