I'm still leaning towards 101 as A9 has a smaller head and what looks to be a white ring around it, while A10 doesn't. But what do I know?
This brings up something related though. This is one of those times when I feel the images Scott uses are sort of well, atrocious. I suppose most of the time it doesn't really matter. Or maybe they've updated the ancient images I'm looking at in this 1995 classic edition?
Apparently they're better than they used to be though. Check out the A9 from my 1925 edition:

That's barely better than a happy face.