I sold it in Louisville, Kentucky, USA.

Actually, my original draft of this opening post said so, but I had forgotten to log in, so it didn't post. When I re-wrote it, I forgot to include where I sold it.

The maker was a man named Herb Good (Goode?) from Pennsylvania; I bought the mandolin from him at a craft fair at an amusement park in PA.

NEVER, ever should have sold it. I got a nice sum for it, but it's literally one of a kind and even though I always say I never regret anything, this comes mighty close.