# Bianchet Flying Tourbillon Grande Date B1.618 Openworked Titanium Review by A.I. WatchMetrics

## Watch Summary
This Bianchet B1.618 Openworked Titanium is a luxury sports watch characterized by its modern titanium case and haute horology flair, featuring a distinctive golden ratio-inspired design with patented bezel grooves, an openworked dial showcasing a flying tourbillon at 6 o'clock and grande date at 12, targeting affluent collectors seeking unique, limited-edition pieces with a manual-wind in-house movement delivering 100 hours of power reserve.

## Overall Watch Rating: 8.4/10.0

**Movement Metric (9.8/10.0)** - The in-house manual-wind flying tourbillon with 100-hour power reserve and refined openworking rivals the technical prowess of entry-level A. Lange & S�hne calibers.
**Complications Metric (9.7/10.0)** - Flying tourbillon combined with instantaneous grande date delivers high-end complexity comparable to mid-tier Greubel Forsey or MB&F models.
**Rarity Metric (9.6/10.0)** - Limited to 99 pieces at around $42,000, it matches the exclusivity of many Oris or Zenith limited editions.
**Material Metric (9.4/10.0)** - Grade 5 titanium case, double AR sapphire crystal, and meticulous brushed/polished finishing benchmark against premium titanium like Grand Seiko Evolution 9.
**Dials & Design Metric (9.3/10.0)** - Patented Grande Rota bezel and phi 1.618 symmetrical openworked dial offer standout artistry akin to H. Moser & Cie's innovative aesthetics.
**Versatility Metric (8.0/10.0)** - 100m water resistance, lightweight titanium, and rubber strap suit sport-casual wear, though the tourbillon orients it toward collector use over daily drivers like Omega Seamaster.
**Functions Metric (6.8/10.0)** - Precise time and grande date perform reliably but lack the multifunction utility of GMT or chronograph-equipped Tudors.
**Brand Metric (6.7/10.0)** - Bianchet provides high-premium Swiss craftsmanship with low-volume appeal, on par with Sinn or Rebellion.
**History & Innovation Metric (6.2/10.0)** - Recent entrant innovates via golden ratio motifs and accessible tourbillon, echoing early De Bethune's niche disruption.

## Total Performance Score (TPS): 6.6
## TPS Interpretation: Good Value: Strong complications and movement elevate it beyond expected performance for the price point.
## Performance Insights: Dominates in movement, complications, rarity, and design while brand history lags, offering solid collector value versus an implied price of $18,500.
## WM Collector Grade: B+

## Watch Data
[Picture URL] - https://bianchetofficial.com/cdn/shop/files/B1.618_Flyingtourbillon_GrandeDate_Openworked_Titanium_1.jpg; [backPicture] - https://bianchetofficial.com/cdn/shop/files/B1.618_Flyingtourbillon_GrandeDate_Openworked_Titanium_back.jpg; [lumePicture] - ; [Nickname] - Phi Tourbillon Titan; [Brand] - Bianchet; [Model] - Flying Tourbillon Grande Date B1.618 Openworked Titanium; [Country] - Switzerland; [Product Link] - https://www.bianchetofficial.com/products/b1-618-kayana-flying-tourbillon-grande-date-openworked-titanium; [reviewLink] - ; [Movement Type] - Manual; [Movement Name] - Calibre B1; [# MSRP] - 42500; [# Secondary] - 30000; [# Production] - 99; [watchDescription] - Luxury titanium sports watch with flying tourbillon at 6, grande date at 12, openworked dial, and golden ratio-inspired patented bezel grooves.; [caseWidth] - 42; [lugToLugLength] - 49.5; [thickness] - 12.3; [lug] - 22; [waterResist] - 100; [powerReserve] - 100; [beatFrequency] - 21600; [lume] - Super-LumiNova Grade X1; [jewels] - 29; [caseMaterial] - Grade 5 Titanium; [watchGlass] - Sapphire double AR; [Bezel] - Fixed titanium Grande Rota; [caseback] - Sapphire see-through; [Crown] - Screw-down titanium; [Strap] - Embossed rubber; [Shape] - Round; [Dial] - Openworked anthracite; [caseShape] - Round; [Seconds] - 1; [Date] - 1; [Calendar] - 0; [Chiming] - 0; [Chronograph] - 0; [Compass] - 0; [dateCompilation] - 0; [DigitalDisplay] - 0; [Dress] - 0; [Field] - 0; [GMT] - 0; [Mechanical Alarm] - 0; [Moonphase] - 0; [Tourbillon] - 1; [worldTimer] - 0; [powerReserveIndicator] - 0; [Diver] - 0; [Pilot] - 0; [racing] - 0; [Skeleton] - 1; [Vintage] - 0; [StyleFormal] - 0; [StyleCasual] - 1; [StyleSports] - 1; [StyleTravel] - 0; [StyleAdventure] - 0; [StyleCollector] - 1; [StyleTool] - 0; [StyleStatement] - 1; [StyleVintage] - 0; [StyleSmart] - 0; [StyleCustom] - 0; [TPS_new] - 6.6; [TPSgrade] - B+; [TPSimpliedPrice] - 18500;

**A.I. WatchMetrics Review v37.10 Grok 4 Fast. December 21, 2025.**