The Letter Box D-4

Elegance and refinement

Warning: the first move is critical. The "Letter Box D-4" is a creation by master Akio Kamei that challenges your insight more than your patience. Based on a 1983 prototype, this work has a simple mechanism, but one that is so well hidden it becomes a formidable challenge.

A Simple Yet Unforgiving Mechanism

Forget long, complex sequences. The solution is simple, but finding it is another story. The secret of the "Letter Box D-4" lies not in the number of its moves, but in the absolute correctness of the first one. A single misstep and the mechanism could jam. It's a puzzle that demands thought and delicacy before you even begin.

The Legacy of a Historic Prototype

This box is a complete reinterpretation of a concept conceived by Akio Kamei in 1983. Its structure and mechanism are entirely different from the famous "Humibako D Series" making it a unique piece in the creator's collection. Crafted from walnut and zelkova wood, its elongated and elegant design makes it as much a work of art as an intellectual challenge.

Technical Specifications

Creator: Akio Kamei (Karakuri Creation Group)

Difficulty: Secret (Simple, but hard to find)

Creation date: 06/2025

External dimensions: 25.0 × 8.6 × 6.6 cm

Internal space: 22.6 × 5.6 × 3.6 cm

Materials: Walnut, Keyaki (Zelkova), etc.

Included: Gift box + solution

Our Promise of Excellence

Every piece in our collection is rigorously inspected and tested by us to guarantee the flawless function and integrity of its mechanism. For your absolute peace of mind, this work is shipped with the utmost care from France, ensuring prompt delivery and absolutely no hidden customs fees within the European Union.