This replica Cubitus 5821/1AR-001 represents the steel and rose gold-tone expression of Patek Philippe’s square sports watch, with a blue sunburst dial set against the warm metal accents of the bezel, crown and bracelet centre links. The 5821/1AR at 45 mm uses a square case with octagonal bezel and integrated bracelet links, continuing the design language Patek launched in 2024 as a new family of sports watches. The dial features the signature horizontal embossing that catches light in fine bands, and the blue creates a cool contrast with the rose gold-tone elements of the case. Applied luminous batons sit on the textured surface, the same layout as the genuine blue 5821/1AR-001. Our genuine 5821/1AR-001 notes list what the original adds in 18k rose gold.

Specifications

• Model: Cubitus (hours, minutes, centre seconds, date)
• Reference: 5821/1AR-001
• Case: stainless steel with rose gold-tone bezel and crown (genuine 5821/1AR: steel and 18k rose gold)
• Case size: 45 mm, square case with octagonal bezel
• Dial: blue sunburst, horizontal embossed stripes, applied luminous batons, date at 3
• Bezel: rose gold-tone octagonal bezel
• Functions: hours, minutes, centre seconds, date at 3
• Movement: clone Cal. 26-330 S C, automatic
• Power reserve: 42 hours (genuine Cal. 26-330 S C: 45 hours)
• Water resistance: 30 m (not for swimming)
• Crystal: sapphire
• Bracelet: integrated two-tone bracelet, brushed steel outer links and rose gold-tone centre links

The clone Cal. 26-330 S C inside copies a genuine calibre that uses a silicon Spiromax balance spring paired with a Gyromax balance for improved stability. This is the same caliber architecture found in the Nautilus 5811.

Blue Dial, Not Gold: Correcting the Record

The 324 S C generation gave way to the 26-330 S C in Patek’s catalogue, and the clone follows the newer calibre’s layout. Its flat construction helps the Cubitus case maintain wearable proportions despite its 45 mm width. Earlier versions of this listing called the dial gold; the photo shows blue, and that blue against the rose gold-tone bezel and crown is what makes the contrast work. For a cooler alternative within the same collection, see the green dial version which shifts the personality toward sport. The full Cubitus range spans both warm and cool dial palettes on identical case architecture.

Warm Metal, Cool Dial

Two-tone sport watches walk a fine line between dressy and casual. This 5821 manages that balance through proportions: the 45 mm square case reads as a sport watch, while the rose gold-tone accents suggest something more refined. The integrated bracelet with its alternating steel and rose gold-tone links reinforces that dual character. Compared to the brown ombre and white dial variants, this blue version is the only one that matches Patek’s own two-tone colourway. That makes this replica Cubitus the two-tone choice for anyone who wants the catalogue look rather than a factory dial.

Other versions of this model in stock: Patek Philippe Cubitus 5821 white dial, Patek Philippe Cubitus 5821 brown dial, Patek Philippe Cubitus 5821 brown dial (70454), Patek Philippe Cubitus 5821 brown dial (70499).