The Gibbs Custer's Last Stand set was not part of the comic book flat series. I had a set. The Gibbs set is much more sought after today.
http://oldtoyfigures.com/gibbs-1959...s-playset-80-figures-playmap-original-box.php
Mine was mint. I never played with it much as I got it toward the end of the toy soldier period of my childhood (the first one, that is {sm4}). I got it mostly because it was sorta unusual and cheap. Wish I still had it but it went in some long-forgotten garage sale...along with my Marx Roy Rogers, Blue & Gray, Alamo, prehistoric, Revell and Monogram WWII models, etc, etc, etc. If I had only known!