# Nubeo Sirius Tourbillon Black Gold LE-300 Review by A.I. WatchMetrics

## Watch Summary
The Nubeo Sirius Tourbillon Black Gold LE-300 is a striking dress-statement watch featuring a fully skeletonized black dial with gold accents and a prominent flying tourbillon at 6 o'clock, encased in a black PVD stainless steel case with gold PVD highlights, appealing to budget-conscious collectors and enthusiasts desiring high-complication horology without luxury pricing, powered by a Chinese manual-wind tourbillon movement delivering 42 hours of power reserve.

## Overall Watch Rating: 7.0/10.0

**Complications Metric (9.5/10.0)** - The flying tourbillon delivers top-tier complexity scoring near perfection, benchmarked against Swiss entry-luxury models like those from Bovet.
**Material Metric (9.0/10.0)** - Premium sapphire crystal, black and gold PVD treatments on 316L steel, and exhibition caseback earn high marks comparable to Sinn's hardened cases.
**Dials & Design Metric (8.8/10.0)** - The intricate black skeleton dial with gold tourbillon and starry accents offers exceptional visual drama, on par with Pagani Design's best homages.
**Movement Metric (8.5/10.0)** - This manual-wind Chinese tourbillon provides reliable high-beat performance and decoration above average for microbrands, akin to Seagull's ST17.
**Versatility Metric (7.0/10.0)** - Suitable for formal and collector occasions but limited by 30m water resistance, matching typical dress watches like Nomos.
**Brand Metric (6.4/10.0)** - Nubeo scores respectably as a microbrand innovator in affordable complications, similar to San Martin or Addiesdive.
**Rarity Metric (5.4/10.0)** - Limited to 300 pieces with a mid-four-figure price, it offers moderate exclusivity like many microbrand LEs on Chrono24.
**Functions Metric (4.8/10.0)** - Basic timekeeping with tourbillon visibility falls average, typical for pure complication showcases versus multifunction divers.
**History & Innovation Metric (4.0/10.0)** - Lacking deep heritage but notable for democratizing tourbillons, it trails established innovators like Omega.

## Total Performance Score (TPS): 9.9

## WM Collector Grade: A+

## Performance Insights: Excels in complications, materials, and design for standout appeal, while brand and history lag, delivering exceptional value at roughly 23% of its performance-implied price.

## TPS Interpretation: Exceptional Value: This limited tourbillon overdelivers on mechanical artistry and finishing far beyond what its accessible price suggests.

## Watch Data
[Picture URL] - https://nubeowatch.com/images/sirius-tourbillon-black-gold-le300-front.jpg; [backPicture] - https://nubeowatch.com/images/sirius-tourbillon-black-gold-le300-back.jpg; [lumePicture] - none; [Nickname] - Black Gold Tourbillon; [Brand] - Nubeo; [Model] - Sirius Tourbillon Black Gold LE-300; [Country] - China; [Product Link] - https://www.nubeowatch.com/products/sirius-tourbillon-black-gold-le-300; [reviewLink] - ; [# Secondary] - 1100; [watchDescription] - Skeleton tourbillon dress watch limited to 300 pieces with black PVD case gold accents flying tourbillon at 6 sapphire crystal and caseback; [caseWidth] - 42; [lugToLugLength] - 49; [thickness] - 12.2; [lug] - 22; [waterResist] - 30; [powerReserve] - 42; [beatFrequency] - 21600; [lume] - None; [jewels] - 21; [caseMaterial] - 316L Stainless Steel Black PVD Gold PVD; [watchGlass] - Sapphire; [Bezel] - Fixed Black PVD; [caseback] - Sapphire See-Through; [Crown] - Push-Pull; [Strap] - Black Alligator Leather; [Shape] - Round; [Dial] - Skeleton Black; [Seconds] - Yes; [Date] - No; [Calendar] - No; [Chiming] - No; [Chronograph] - No; [Compass] - No; [dateCompilation] - No; [DigitalDisplay] - No; [Dress] - Yes; [Field] - No; [GMT] - No; [Mechanical Alarm] - No; [Moonphase] - No; [Tourbillon] - Yes; [worldTimer] - No; [powerReserveIndicator] - No; [Diver] - No; [Pilot] - No; [racing] - No; [Skeleton] - Yes; [Vintage] - No; [StyleFormal] - Yes; [StyleCasual] - No; [StyleSports] - No; [StyleTravel] - No; [StyleAdventure] - No; [StyleCollector] - Yes; [StyleTool] - No; [StyleStatement] - Yes; [StyleVintage] - No; [StyleSmart] - No; [StyleCustom] - No; [TPS_new] - 9.9; [TPSgrade] - A+; [TPSimpliedPrice] - 5200;

**A.I. WatchMetrics Review v37.4 Grok 4 Fast. December 19, 2025.**