Marvel Feature #1 is a huge Bronze Age key book which contains the origin and 1st appearance of the Defenders (Hulk, Namor the Sub-Mariner, and Doctor Strange).  This book is giant sized and square bound so is always tough to find without crushed, twisted, or otherwise-damaged spine.  This one looks great, with nice alignment.  The book is graded 9.6 NM+ with white pages by CBCS.