The triangles shoild be slighlty rounded to avoid the dice falling on them. Then it would be perfect.
It looks like that's what new D18s do
https://www.thediceshoponline.com/specialist-dice/d18-specialist-dice.html
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Some of those D18s are this style with the roundings, but some of them look... weirdly different.
None of them, however, have that historic feel. 😉