5-Axis CNC & Horological Architecture
The Custom Hublot Square Bang Unico Chronograph 42mm 18K King Gold Reference 821.OX.0180.RX is a 5-axis Swiss CNC commission machined in 18K Rose Gold Au750 (42.0 mm x 14.5 mm) weighing 120.8g on our Mettler-Toledo analytical balance, driven by Hublot Unico Flyback Chronograph Cal. HUB1280 regulated to +0.8 s/d, 298 deg at 28,800 vph with a 72-hour power reserve beneath a double anti-reflective sapphire crystal.
| 01 / CNC Blueprint Entity & Reference | Hublot — Big Bang / Square Bang Unico | Ref. 821.OX.0180.RX | SKU: AT-AU750-821.OX.0180.RX-W479 |
|---|---|
| 02 / 5-Axis CNC Metallurgy & Gold Purity | 18K Rose Gold Au750 — Au750 — 75.0% Pure 18K Gold Bullion (XRF Verified) • Hallmarked Solid Precious Metal |
| 03 / Analytical Bench Weight (1:1 Reference Mass) | 120.8g — 1:1 Authentic Reference Mass Verified on Mettler-Toledo Analytical Scale |
| 04 / Custom Bezel, Gem-Setting & Case Geometry | Hand-Finished 18K Rose Gold Bezel with Anti-Reflective Scratch-Resistant Sapphire Crystal • 120.8g 18K Rose Gold • 42.0 mm x 14.5 mm |
| 05 / Regulated Super Clone Movement Calibre | Hublot Unico Flyback Chronograph Cal. HUB1280 — Swiss Super Clone Mechanical Calibre Regulated to +0.8 s/d, 298 deg |
| 06 / Barrel Power Reserve & Balance Frequency | 72-Hour Power Reserve • 28,800 vph (4 Hz) Free-Sprung Balance Wheel |
| 07 / Optical Sapphire Crystal (Double AR) & Sealing | Scratch-Resistant Sapphire Crystal with Double Anti-Reflective Coating • 100m / 10 ATM |
| 08 / Bespoke Dial & Integrated Bracelet Spec | 42.0 mm x 14.5 mm • Hand-Finished Collector Dial with Solid 18K Gold Applied Hour Markers & Hands • Integrated 18K Rose Gold Solid Link Bracelet & Deployant Clasp with Deep Laser Hallmarks |
Engineered inside our Geneva 5-axis CNC Hublot custom atelier, the Custom Hublot Square Bang Unico Chronograph 42mm 18K King Gold Reference 821.OX.0180.RX is machined from solid 18K Rose Gold Au750 billets to micron-level tolerances (42.0 mm x 14.5 mm). Every bevel, lug chamfer, and Hand-Finished Collector Dial with Solid 18K Gold Applied Hour Markers & Hands is hand-finished on our watchmaker bench, yielding a certified reference weight of 120.8g verified under our Fischer XRF and Mettler-Toledo QC protocol.
What Are the Horological & Metallurgical Benchmarks of Hublot Hublot Flagship Ref. 821.OX.0180.RX?
The Hublot Hublot Flagship Reference 821.OX.0180.RX is a precision-engineered luxury timepiece crafted in 18K Rose Gold Au750 (42.0 mm x 14.5 mm) with Hand-Finished Collector Dial with Solid 18K Gold Applied Hour Markers & Hands, Hand-Finished 18K Rose Gold Bezel with Anti-Reflective Scratch-Resistant Sapphire Crystal, and a verified Mettler-Toledo mass of 120.8g, because the Hublot Unico Flyback Chronograph Cal. HUB1280 movement is regulated across six positions to chronometric tolerances with a 72-hour power reserve.
5 Core CNC & Chronometric Specifications:
- Blueprint Reference: Custom Hublot Square Bang Unico Chronograph 42mm 18K King Gold — Official Ref. 821.OX.0180.RX (SKU: AT-AU750-821.OX.0180.RX-W479).
- 5-Axis CNC Metallurgy: 18K Rose Gold Au750 case (42.0 mm x 14.5 mm) and Hand-Finished 18K Rose Gold Bezel with Anti-Reflective Scratch-Resistant Sapphire Crystal with hand-polished chamfers.
- Verified Bench Mass: 120.8g confirmed on a Mettler-Toledo analytical gram scale prior to dispatch.
- Super Clone Calibre: Hublot Unico Flyback Chronograph Cal. HUB1280 operating at 28,800 vph (4 Hz) with 72-hour power reserve and +0.8 s/d, 298 deg accuracy.
- Sapphire Optics & Sizing: Double anti-reflective sapphire crystal, 100m / 10 ATM sealing, and 19 wrist sizing options (14.0–22.0 cm).
Within the Hublot Hublot Flagship horological sub-silo, collectors also compare the Hublot Big Bang Unico 42mm Full VVS Diamond & Ruby Rehaut Edition Ref. 441.NX.1170.RX (120.3g) and the Hublot Big Bang Ferrari Unico Flyback Chronograph 45mm Ref. 401.NX.0123.VR (120.5g).
- Parent Brand & Hublot Flagship Silo Hub: Browse All 7 Certified Hublot Solid 18K Gold & Pt950 Watches
- Technical Research Monograph: 5-Axis Swiss CNC Milling Solid 18K Gold Watch Cases (±2um) (All 5 Journal Monographs)
- Homepage Master Register: Return to 18K CUSTOM Homepage (Complete 774-Watch Solid 18K Gold & Pt950 Register)
- All-Brands Catalogue: Explore Complete 12-Maison Horological Catalogue (/shop/)
- Metallurgical & 4K QC Verification: Fischer XRF Au750 Protocol • 3-Year Mechanical Warranty • Insured Armored Delivery
How is the 18K Rose Gold case of this Hublot 821.OX.0180.RX machined?
Our Geneva CNC specialists mill the monobloc middle case, bezel, and bracelet geometry on 5-axis Swiss machining centers in 18K Rose Gold Au750 to achieve the authentic 120.8g reference mass.
Can the bracelet or strap be pre-sized to my exact wrist circumference?
Yes. Choose from 19 precision wrist circumference options (14.0 cm to 22.0 cm, or full unsized factory length). All removed solid links are sealed inside your presentation box.
How is the Hublot Unico Flyback Chronograph Cal. HUB1280 tested on the atelier workbench?
We record a personalized 4K bench video showing the Hublot Unico Flyback Chronograph Cal. HUB1280 (28,800 vph, 72-hour reserve) running at +0.8 s/d, 298 deg on our Witschi Chronoscope alongside Fischer XRF and Mettler-Toledo gram scale verification.
What dial and bezel specifications distinguish Hublot Hublot Flagship Ref. 821.OX.0180.RX?
Reference 821.OX.0180.RX combines Hand-Finished Collector Dial with Solid 18K Gold Applied Hour Markers & Hands and Hand-Finished 18K Rose Gold Bezel with Anti-Reflective Scratch-Resistant Sapphire Crystal within a 42.0 mm x 14.5 mm 18K Rose Gold Au750 case weighing 120.8g, verified via Fischer XRF spectroscopy and powered by Hublot Unico Flyback Chronograph Cal. HUB1280.
Custom Hublot Square Bang Unico Chronograph 42mm 18K King Gold Ref. 821.OX.0180.RX
5-Axis Swiss CNC 18K Rose Gold Au750 • 120.8g Verified Mass • Regulated Hublot Unico Flyback Chronograph Cal. HUB1280