nano universe x Seiko Collaboration Solar Wristwatch Black Leather HFJ004P

The nano universe × Seiko Collaboration Solar Watch — Black Leather (HFJ004P) is a 2026 Autumn/Winter collaboration between nano universe and Seiko. Where the Silver and Gold models carry metal bracelets, the Black Leather model introduces contrast: a gold-plated case against a black leather band. The warmth of gold against the formality of black leather creates the most versatile piece in the series — equally at home in a formal outfit and an everyday one.

The case is stainless steel with gold-colour plating, 27mm x 18mm, Roman numeral dial. The band is genuine cowhide leather in black, adjustable from 11.5cm to 15.5cm — a narrower fit range than the metal bracelet models, suited to smaller wrists. Solar movement, Japanese caliber, assembled in China. Daily life water resistance.

Key Features:

• Gold x Black — Gold-Plated Case, Black Leather Band: The contrast colourway of the series. Gold-plated stainless steel case against black genuine leather — the pairing that reads both polished and understated, suited to a wider range of occasions than an all-metal watch.
• Genuine Cowhide Leather Band — 11.5–15.5cm Wrist Range: Black genuine leather band for wrists in the 11.5–15.5cm range. The leather band version sits more quietly against the wrist than the metal bracelet models — a different wearing quality from the same watch format.
• Seiko Solar — Japanese Movement, No Battery Replacement, ±15 sec/month: Solar caliber, Japanese movement, assembled in China. Charges from light; no battery replacement. ±15 seconds per month accuracy.