Some prefer to buy Neal's work from Marvel or DC, while others would prefer to own a drawing of the creator's origin. This is for the later. Actually, Megalith was the creation of Neal's son Joel Adams. But certainly, Megalith is owned by Neal's own company, Continuity.
This particular drawing was featured in the book, Neal Adams Sketches, available on this site as well.
This piece is 11 x 14 on 2ply Bristol.