You must be logged in and verified to contact the designer.
D7 Sphere 2-fold
It's a Truncated Sphere 7-sided die.
Most of the 7-sided dice are based on a pentagonal prism. This one instead is based on an original polyhedron with nice symmetries (globally, it has a 2-fold symmetry).
This is a new version which is solid (not hollow anymore) and with slightly smaller numbers than those on the pictures.