On 2007-05-06, Andy <q> wrote:

> It's a vintage KYM Mokka coffee grinder....

Yep. It's of the type known as a "knee mill". The concave sides are
to help hold the grinder between your knees while grinding. I have a
German Zassenhaus knee mill (coffee) I use for espresso. That KYM mill
also has conical grinding burrs, the best for coffee.

nb