Ok, so this is even more interesting than I first thought!
As it turns out, your pencil is a unique piece I don’t have!
And based on my oldest Pilot drafting pencil, I now believe your piece is a “missing link” between the earliest era and the H-215 era.
Here’s the piece I think is Pilot’s oldest drafting pencil:
Things to notice:
- PILOT logo features extended kerning (distance between letters)
- Area with logo is not within a “box” depression in the resin mould
- ¥300 pricing sticker suggests this came from the Land Before Time
- Barrel shape is hex in the middle, rounded on the ends (shallow gradient mould)
- Metal end cap flange elevates this pencil above similar models with a plastic terminus
- Pilot’s oldest drafting tip with 7 grooves and a 4mm tip
And now here’s a Pilot H-215, which came later… and what I think is ultimately the evolution of your pencil:
Things to notice:
- PILOT logo has tighter kerning
- Logo sits within a “boxed” depression in the barrel
- Barrel is hex in the middle and rounded on the ends, but with a steeper gradient mould pushed out toward the ends more
- No metal flange at the end cap
- Pilot’s “new standard” 3.5mm drafting tip with smooth, graduated cone sections (no grooves)
- H-215 is nearly 1cm shorter than the older piece shown above
Now, here’s what I notice about your specimen:
- Older logo style with extended kerning
- Barrel is almost entirely hex with extremely steep gradients on the ends (the gradient is when it goes from hex to rounded)
- Newer drafting tip (3.5mm)
- Boxed depression where the logo sits
- Is there a metal flange near the end cap? I can’t tell for certain from the existing pictures
Finally, you can tell that the black + gold specimen is simply an H-215 with gold trim and that special water droplet tip (which, again, I adore).
So what’s the end result of all this?
We now know there’s at least one “economy” drafting pencil Pilot released between the time of my extremely old piece and the advent of the H-215.
We also know that, based on the logo style, your old pencil was released alongside at least one other interesting drafting model. (Obviously, the logo is not pictured there, but these burgundy and black specimens have triangular barrels with a diamonized surface texture. You’ll have to trust that the logo matches that found on your pencil 
)
In the past couple of months, I’ve learned the triangular piece also came in navy blue, and it may have been considered a general writing model instead of a drafting model (the tip is about 2.3mm instead of 3.5mm).
I suspect the oldest drafting models only came in black, but general writing models were more colorful.
Now I’d love to know which year Pilot switched to a more tightly-kerned logo and rolled out the H-215.
. I probably won’t be able to afford many of these big sets until I get a job.
