Many thanks to @Knockologist for the generous gift of my missing P35 Dark Green. At one time, I’d thought it was a pure black; even now I still wonder if a true black was produced.
In place of a black P35, I have snuck in a P305A instead, an older design with a somewhat similar concept: a molded diamond-shaped grid for its grip, except that it was a raised ridge instead of an undulating tessellation on the Hue.
I recall reading a Pentel blog entry about the Hue designer, Mr Shimizu, reminiscing about the challenges the design posed for prototyping. Apparently the mold makers or sculptors had a hard time of it (I don’t think they used CAD or had 3D printers back in 1998). Here’s a fascinating image of the prototype designs on paper:
As for the P305, I know there are other colors made, but I don’t know if I’ll ever luck on them in the future. If you have them, please share more pix, please!