Sorry for taking so long to reply, but it has taken me a while to search for them. I did find a reference to Joyce and Richard Angell in her mother's obituary in 2009. I also found a reference where someone mentioned Joyce as the maker of her dulcimer. And that's it. There still is a Richard H. Angell living in Texarkana on McKeehan Lane. His mother-in-law's last name was McKeehan. I don't know if that area had a split in area code as the phone number begins with a different on than on the card but follows with the 799 prefix. The listing gives two female relatives neither of whom is a Joyce. His age is listed as 71. This was all I could get for free. I have no idea if this the dulcimer maker.
Now as the dulcimer itself, I think you can assume that the dulcimer was made by one or the other Angell. It appears to be well built and is nicely decorated. As to value it is anyone's guess. Obviously the Angell's are not well known as dulcimer makers. My guess is that on a site like eBay it would probably bring between $200 and $300 dollars.
Ken
"The dulcimer sings a sweet song."