Hi Jeff,
So now that you have drawn the curve from that angled perspective for reverse engineering, you could try to switch to that cplane and view the curve from that particular angle, to see if you could recognize it as something other than arbitrary.. For instance, it may be very close to some radius value! Then you could make a determination that it "IS" truley a radius, and just draw that...

For added information...

Hello Burr,

I did look at is from the side view (basically what you are saying). I just rotated the 3D view until I could see the curve from the side.

It was an interesting revelation. It's pretty much as I thought the build process would go. It looks like it was either cut off or sanded flat then blended into the top and the bottom edge softened. I guess I could model it the same. cut it off with a plane and then ease the edges.

Thanks for your comments and insights.

Jeff