Square Nautilus-inspired 5821 White Sunburst Full Steel Super Clone

Premium top-tier factory exclusive launch: the all-new 2025 Square Nautilus-inspired 5821 large size model, the bold nautilus-inspired square sports timepiece. Many of our US customers also refer to this model as Cubitus 5821, that's why we know this is exactly what you are looking for.

This model is designed to fit bigger wrists perfectly, following the legendary 5711, this is the bold large-size version that delivers a strong presence on the wrist, ideal for users who prefer a more prominent, sporty look than the smaller 40mm version.

Core Craftsmanship Highlights

• Upgraded Stop-seconds Movement: Powered by the customized 9015 modified Cal.26-330 SC integrated automatic self-winding movement. This upgraded movement features stop-seconds function when setting time, the balance wheel position matches the authentic version exactly. It delivers precise sweep seconds, 35-45 hours power reserve, and the exact same visual layout as the official version.
• Ergonomic 316L Steel Bracelet: Equipped with 316L medical-grade custom ergonomic steel bracelet, paired with the upgraded new fold-over clasp. The bracelet fits perfectly on your wrist, we provide free size adjustment for big wrists, providing all-day comfort without any irritation, while the new clasp ensures secure and easy wearing, balancing casual and elegant style perfectly.
• Exact Official Size & Weight: With a 45mm case diagonal measurement (from 10 o'clock to 4 o'clock, excluding the crown), the case thickness is only 8.3mm, exactly the same as the official version. This full steel case delivers a premium solid feel exactly like the authentic version, bringing you the real luxury experience.

The stunning sunburst white dial features a unique horizontally embossed pattern, catching light from every angle to create a clean, bright visual effect. The full steel case and bracelet delivers a premium solid feel, perfect for both formal business occasions and casual daily wear, it's the most versatile all-match style in the entire 5821 collection. The contrast between vertical satin-brushed and polished finishes on the case and bracelet highlights the bold geometry of the large square case with rounded corners, making it perfect for any occasion.

Our Premium Service Guarantee

• Video Proof Before Shipping: We will take exclusive real video for you before shipping, you can check every detail of your watch before payment, no scam, no fraud.
• Discreet Worldwide Delivery: Plain packaging without any logo, customs-friendly shipping, full tracking available, deliver to your door safely.
• 2-Year Full Warranty: We provide 2-year full warranty for all our watches, any movement or craft problem, we will fix it for free.
• Free Bracelet Adjustment for Big Wrists: Exclusive free size adjustment service for big wrist users, we can extend the bracelet to fit up to 9.5 inches wrist perfectly, no extra charge.
• No Reason Return: 7 days no reason return policy, if you are not satisfied with your watch, you can return it for full refund.

If you like this 45mm big wrist basic style, you might also be interested in:

• Our 7128 Regular Wrist Basic Collection, if you have a regular wrist and want a smaller case size
• Our 5822 Big Wrist Annual Calendar Collection, if you want the multi-function annual calendar model for big wrists
• Our 5821 Full Pavé Diamond Collection, if you are looking for the luxury iced out style