Wtopia 10th Anniversary × Sunizumi Shoten ONE-OFF EDC Challenge Coin / Worry Stone

Product Description

Wtopia 10th Anniversary × Sunizumi Shoten ONE-OFF Collaboration

Created to commemorate Wtopia’s 10th Anniversary, this exceptional ONE-OFF EDC Challenge Coin / Worry Stone is a special collaboration between Wtopia and Sunizumi Shoten.

The body is crafted from a proprietary mixed-metal composition combining nickel copper, bronze, and copper, resulting in a substantial feel and a distinctive surface character unique to the piece.

As the metals naturally react to handling and the surrounding environment, the surface will gradually develop its own patina and tonal variations over time.

The design brings together signature elements from both collaborators.

The Wtopia side features a bronze ginkgo-inspired motif with an inlaid silver skull, while the Sunizumi Shoten side incorporates a copper base with an inlaid silver emblem.

Measuring only approximately 24 × 24 mm yet weighing around 55.3 g, the piece has a remarkably dense and satisfying feel in hand.

It can be enjoyed as a collectible EDC challenge coin, a tactile worry stone, or simply as a unique piece of Japanese metalwork.

As a true ONE-OFF anniversary collaboration, this piece represents both Wtopia’s 10-year milestone and a unique chapter in the collaboration between Wtopia and Sunizumi Shoten.

Specifications

• Collaboration: Wtopia × Sunizumi Shoten
• Anniversary: Wtopia 10th Anniversary
• Type: ONE-OFF EDC Challenge Coin / Worry Stone
• Main Material: Proprietary Nickel Copper / Bronze / Copper Alloy
• Wtopia Inlay: Bronze Motif with Silver Skull
• Sunizumi Shoten Inlay: Copper Base with Silver Emblem
• Dimensions: Approx. 24 × 24 mm
• Skull Dimensions: Approx. 16 × 10 mm
• Weight: Approx. 55.3 g
• Made in Japan

Material & Care

Nickel copper, bronze, copper, and silver naturally develop oxidation, tonal changes, and patina through exposure to air and regular handling.

These changes are part of the character of the materials and allow the piece to develop a unique appearance over time.

Wipe gently with a soft, dry cloth after handling and avoid prolonged exposure to moisture, saltwater, acidic liquids, or harsh chemicals.

If you prefer to preserve the naturally developing patina, avoid frequent use of aggressive metal polishes.