Hublot · Classic Fusion

Strap for Classic Fusion 45 Chronograph King Gold / Blue

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

20mm

20 mm straps All Hublot

Lug width20 mm

Case diameter45 mm

Reference521.OX.7180.LR

FamilyClassic Fusion

MovementHublot caliber HUB1143 Hours, Minutes, Small Seconds | Date | Chronograph

CaseTitanium, Red Gold, Resin

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

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Straps for the Classic Fusion 521.OX.7180.LR

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Classic Fusion 521.OX.7180.LR, seen from the bench

The Classic Fusion 45 Chronograph King Gold Blue (ref. 521.OX.7180.LR) from Hublot's Classic Fusion Chronograph line combines titanium, 18k rose gold, and resin in a 45mm case. Powered by the Hublot HUB1143 automatic chronograph movement with hours, minutes, small seconds at 9 o'clock, and date, this model features a 20mm lug width. The material combination—titanium for structural lightness and corrosion resistance, rose gold for visual warmth on lugs and bezel, and resin for shock absorption—defines the Art of Fusion philosophy applied to sport-chic haute horlogerie.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only