I traded emails with Mr. Huron through the John C. Campbell Folk School website, and he told me the top was sassafras, and that the sound holes were 'Mountain Crescents'. Learn something new every day...

He also sent me this link: 

Steven, it sounds very nice, in spite of my playing ability. It's currently set up with three string and works well for me with a noter.

Needs new strings, though, as the existing ones are black with age. 

Can anyone help with the string gauges? These have ball ends, and not the loop ends that my other instruments have.

Fiddle edges! Makes perfect sense! Mine has guitar style purfling.

One of each please and a large Ice Tea.

I'll see John in a few weeks. He made very nice dulcimers based on the James Edward Thomas pattern. He also built some fine mountain banjos. Your dulcimer looks very nice.

Ken

"The dulcimer sings a sweet song."

Fiddle edges

Agreed, that is, indeed, one sweet looking dulcimer.

I admire the way the top and back are larger than the body (I bet that has a name, huh?)

Beautiful dulcimer, Dave D! How's it sound?