"Made by U.N. Co. N. Y.", circa 1920?, level 1, no holes, notchable, 2x2x8 pieces.
(cardboard box, 3.2 by 2.2 by 5/8 inches, and six 1/2" x 1/2" x 2" wood pieces)

Along wth the Mikado Block Puzzle, this puzzle is discussed on page 262 of the Puzzlers' Tribute Book in a chapter by Jerry Slocum and Rik van Grol on antique Japanese export puzzles. Here is the solution sheet that came with it and a photo of another one of these puzzles where someone has labeled the pieces: