This is an Annular twist pen from Crooked Mill, in gunmetal. It's obviously a copy of the discontinued PSI Knurl GT. The wood is unknown to me. I found it in my garage. It looks like I cut it from a tree branch, but I can't remember. Whatever it is, it has some spectacular grain and figure. I wish I knew what it is, I'd like to find some more. The finish is Pens Plus. Made a great looking pen.