Attributed as 19thC American, 10 inches wide, 14 inches high, 3.5 inches deep. i.e. Holy smokes, that's small. Hardly bigger than a sheet of paper.
The carry handle is anything but flimsy. And pivots. For a purpose, or just what was available?
Anyway, it's given me plenty of entertainment. Trouble is it's also distracted me into wondering about building one, which is entirely not helpful. Where's that To Do List...?