Just for the sake of curiosity, I took a scrap of the left over O-1 I had, did a quick HT on it and then broke it in my vice.
I am trying to get pictures, but I'm not getting anything that shows detail...
The piece broke like glass, rather easily considering it is steel...
The inside is a very light grey color, and relatively smooth to the touch.
Under 20X magnification I can see tiny microscopic grains, but only because of the occasional glint of light off of them...
In my dark garage when I do the HT it looks like it goes a little into the orange spectrum, but that's also right above nonmagnetic, so I think I have things just about right for my first blades... and I don't see any signs of grain growth.
I have several pieces of olive wood cut to about 1/8th, and sanded smooth for my scales, so I'm on to the next step...
as always, more pictures to follow.