DESIGNER: Marcel Gillen MATERIAL: Aluminum and Brass SIZE: 3.75" x 2.5" x 2.5" Machinist's Stash is Ukrainian engineer Andriy Bruns' reinterpretation of Marcel Gillen's excellent "Fire Plug" Puzzle. This puzzle box is handcrafted under license in small batches by Andriy in his Ukraine workshop. The tolerances and attention to detail are outstanding, earning Machinist's Stash a solid place on any collector's shelf. You will not solve this tricky puzzle with casual fiddling; you'll need to analyze and focus to solve the mechanism and reveal the secret compartment. We have been fortunate to obtain roughly 75 copies of this excellent and long-discontinued puzzle. Machinist's Stash ships in an unsolved configuration. Handling Metal Puzzles All metals tarnish over time. Residual oil and salt from handling speed up the process and may leave undesirable fingerprints. Occasional use of our Metal Puzzle Polishing Kit with a coat of Renaissance Wax will keep your metal puzzles in tip-top shape!