Craig was a subbrand of Sheaffer, and highly collectible.  The usual finds are the black pencils like the one in the center of this picture; they also come in bright yellow. 

Less common are the golf pencils (I have to brag a little -- this one has a price sticker on the back).

I never knew the aluminum ones existed until this one turned up at the 2011 Chicago Pen Show.  That's when I also found out they come in ringtop form, too!