Alrighty, here are the pics. I got a vintage natural combination coti today as well, so I'll through in some pics of that as well.
The top and bottom look to be slightly different colors, the bottom appears (to me) slightly more greenish.
http://imageshack.us/a/img201/7878/p1000537t.jpg
http://imageshack.us/a/img96/5084/p1000538f.jpg
http://imageshack.us/a/img839/6085/p1000535d.jpg
http://imageshack.us/a/img827/394/p1000539ib.jpg
And here's the coti- the remnants of it's original stamp are still visible. I can't make out the words, but it looks like it might have had a crown or paw in the center.
http://imageshack.us/a/img22/687/p1000543m.jpg
http://imageshack.us/a/img833/1264/p1000546qp.jpg
Anyway, I can't wait to start honing. The coti seems pretty hard, it's a lot harder than the slurry stone I got from the superior shave, and after 125 laps with water on it I saw no signs of natural slurry release.