Blackbird Box by Olde Colonial Designs
A shop owner friend of mine had three of these left in stock that she didn't think she'd sell. I bought them from her, and you can get one (but I only have three, and can't get more). The boxes were made by Bob at Olde Colonial Designs who had a tough year health-wise, so he hasn't been making too much. Blackbird Designs also had a project that fit in the box. The VISIBLE opening is 10 by 10 inches. The box opens to a felt interior. These are first-rate and very hard to come by. When these are gone, I can't get more (at least for now).