Yamato Block - Brass 6 Piece Burr Puzzle

Vintage The Yamato Block Puzzle Wooden with Solution Made in Japan

Yamato Block - Brass 6 Piece Burr Puzzle

Making the 6-pc notched burr puzzle: Woodworking project

Rob's Puzzle Page - Interlocking Puzzles

geometry - Old 6-piece wooden cross puzzle - Puzzling Stack Exchange

Rob's Puzzle Page - Interlocking Puzzles

Diabolical Structure - Brass 6 Piece Burr Puzzle

6-Piece Wooden Cross Puzzle Solution

National Museum of American History