Walnut, one of the world’s three most prized hardwoods, is characterized by its rich, deep brown base and subtle gradations of color that create a soft, natural harmony. Over time, it develops an even greater depth and luster, maturing into a calm, refined expression with an unmistakable sense of luxury.

This treasure box is simply finished using “Kone Oi-ire Kumitsugi,” a traditional Japanese joinery technique that has been passed down through generations.

Please note: This is a standard production item, so the wood grain will vary from piece to piece.

The interior is lined with Ultrasuede®, an easy-to-maintain high-performance synthetic fabric. It features a distinctive texture reminiscent of fine suede, with a soft and smooth feel. It is also highly durable and resistant to wear, stains, and water—qualities that have led to its use in premium European automotive interiors.

SIZE W355 D123 H92

MATERIAL Walnut / Ultra suede lining

Designed by Toshihiro Kamei

Cushions are available in three sizes: S / M / L.
Please choose the size that best fits your wrist. We Will contact you for the cushion size after you have completed the purchase.

 S:14~16cm  M:17~19cm  L:20~22cm

【Characteristics of KOMA watch case】

Grain Matching

By carefully arranging and cutting each component in sequence, the wood grain flows seamlessly from one piece to the next. With meticulous attention to detail, our skilled craftsmen match the grain one by one—honoring the natural beauty of the wood and bringing out its finest expression through both refined aesthetics and expert technique.

Mitered Joinery 

By joining the top, side, and front panel with precise 45° miters, the grain continues uninterrupted, creating a beautifully seamless finish. This technique also provides excellent structural strength and helps prevent misalignment at the joints over time.
It is a highly advanced method that requires exceptional skill and a great deal of time and effort.

Assembling

Assembling mitered joints is an intricate process that can only be achieved through skilled handwork.

For both the upper and lower sections, dozens of specialized clamping tools—such as shakoman and hatagane—are used to secure the wood in place. It is an extremely delicate step, where even the slightest difference in pressure on each clamp can affect the final alignment.

Spline Reinforcement

To reinforce the corners formed with mitered joinery, a 0.5 mm wooden spline is carefully inserted into the joint.
This not only increases overall strength, but also creates a distinctive and beautiful detail—an expression unique to fine craftsmanship.

Finishing / Oil Treatment

Each piece is carefully refined with hand planes and sandpaper to enhance the grain and bring out the full natural beauty of the wood.
Before applying the oil finish, we seal the surface pores as a base preparation. This helps prevent water rings and staining, while achieving an exceptionally smooth, silky feel to the touch.

Please note: To preserve the wood’s natural beauty and texture, we do not use polyurethane coatings or colored stains.

Concealed Hinges

When the box is closed, the hinges are completely hidden from view at the back.

As the interior is fully finished, no hardware is visible from any angle—preserving the box’s clean, seamless design and the beauty of the wood grain.

Please note: As this is a standard production item, the wood grain, color, and overall appearance may vary from piece to piece. Thank you for your understanding.

We hope you enjoy the unique character of natural wood, along with its individual expression and the way it ages beautifully over time.