Hi Booleano,

Do you have a top view?

What is it?


- Brian

Looks like a "cone", with lip slit, and rolled down.

https://www.wikihow.com/Make-a-Funnel-or-Cone-from-Paper#:~:text=Take%20one%20of%20the%20far,of%20a%20cone%20in%20place.
The rim of the cone has the triangular extension which would be slit and rolled down...

Maybe the "cone" should be squircle shaped?
And blend to cylinder...

Is it wood, horn, leather?
There is no sign of a seam?