Very nice! I think the standard is from the deepest part of the grip, but I have read that some bowyers specify otherwise.
Someone with more knowledge will be along soon.
I have had luck with a suggestion that I got form bowdoc-he suggested that I use tru-oil to touch up the old Bears that I have that might need something sealed, but don't need the full treatment. It matches the finish well, and I'd be willing to bet that it would work on the old Damon-Howatt bows also.
That is a nice looking bow!
RonP