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IWC Schaffhausen · Pilot's Watches

IWC Schaffhausen Pilot's Watch Chronograph (steel, 15.4 mm thick)

Reference IW377709 · Chronograph · 43 mm Discontinued

121245781011Ø 43 mmLug-to-lug 53.6 mm
Illustration drawn from the specifications: case to scale, colours and style approximate. Not a photo. Photos on the official page

Specifications

Reference
IW377709
Family
Pilot's Watches
Category
Chronograph
Status
Discontinued
Case material
Stainless steel
Case diameter
43 mm
Case thickness
15.4 mm Official
Lug-to-lug
53.6 mm Third-party
Lug width
21 mm Official
Water resistance
60 m
Bezel
—
Calibre
79320 Official
Power reserve
44 h
Frequency
28,800 vph (4 Hz)

Official product page · retrieved October 22, 2026

Does it fit your wrist?

Enter your wrist circumference. The watch appears to scale on the flat top of the wrist.

121245781011Lug-to-lug 53.6 mmFlat top of the wrist 54.1 mm
Top view on a wrist, to scale
Flat top of the wrist 54.1 mmLug-to-lug 53.6 mmCase diameter 43 mm
Side view, across the wrist

At the limit

Lug-to-lug 53.6 mm on a flat top of 54.1 mm: 99 % of the width.

Lug-to-lug is 95 to 100% of the flat top. The lugs reach the edge, so check your wrist shape.

Measurements and sources

Brands rarely publish thickness, lug width and lug-to-lug together. Each observation below is kept separate, with who gave it.

Case thickness

Value Type Source Date
15.4 mm Official IWC October 22, 2026

Lug-to-lug

Value Type Source Date
53.6 mm Third-party The 1916 Company Review titled "IWC Pilot's Chronograph Limited Edition Racing Green IW3777-26": "measures 15.1mm in thickness and 53.6mm from lug-to-lug". Median of 2 reviews of this case. October 24, 2026

Lug width

Lug width is the gap between the lugs, where the strap fits. It is not lug-to-lug.

Value Type Source Date
21 mm Official IWC October 22, 2026

Calibre source

Official IWC · retrieved October 22, 2026

Other versions in the same case

These references differ only by dial, bracelet or bezel colour. The brand gives them the same case dimensions, so the figures on this page apply to them too.

  • IW377710 · discontinued
  • IW377719 · Spitfire · discontinued
  • IW377714 · Edition “Le Petit Prince” · discontinued
  • IW377717 · Edition “Le Petit Prince” · discontinued
  • IW377713 · Edition “Antoine De Saint Exupéry” · discontinued

Other Pilot's Watches references

Watch Ø Thickness Lug-to-lug Calibre
Pilot's Watch Chronograph IW378001 43 mm 14.8 mm — 69385
Pilot's Watch Performance Chronograph Perpetual Calendar IW388801 43 mm 16.5 mm — 89802
Pilot's Watch Chronograph 41 Le Petit Prince IW389410 41.9 mm 15.5 mm — 69381
Pilot's Watch Chronograph 41 TOP GUN IW389401 41.9 mm 15.5 mm — 69380
Pilot's Watch Chronograph 41 IW388101 41 mm 14.5 mm 51.7 mm 69385
Pilot's Watch Chronograph TOP GUN IW389101 44.5 mm 15.7 mm 53.9 mm 69380
Pilot's Watch Chronograph 41 TOP GUN Ceratanium IW388106 41 mm 14.5 mm — 69385
Pilot's Watch Performance Chronograph 41 IW388309 41 mm 14.7 mm — 69385
Pilot's Watch Performance Chronograph 41 (41 mm) IW388304 41 mm 14.7 mm — 69385
Pilot's Watch Chronograph (ceramic) IW389002Discontinued 44.5 mm 15.5 mm 54 mm 89361
Pilot's Watch Timezoner Chronograph IW395001Discontinued 46 mm 16.8 mm 55 mm 89760
Big Pilot's Watch 43 IW329301 43 mm 13.6 mm 52.6 mm 82100
Big Pilot's Watch 43 Spitfire IW329702 43 mm 14.4 mm — 82100
Big Pilot's Watch 43 Tourbillon IW329501 43 mm 14.5 mm — 82905
Big Pilot's Watch Perpetual Calendar ProSet Le Petit Prince (ceramic) IW339601 42.9 mm 14.3 mm — 82665
Big Pilot's Watch Perpetual Calendar ProSet Le Petit Prince (steel) IW329601 42 mm 14 mm — 82665
Big Pilot's Watch 43 TOP GUN IW329801 43.8 mm 13.9 mm — 82100
Big Pilot's Watch Perpetual Calendar ProSet IW329602 42 mm 14 mm — 82665
Big Pilot's Watch Shock Absorber Tourbillon Skeleton XPL IW357701 44 mm 13 mm — 82915
Big Pilot's Watch Shock Absorber XPL Toto Wolff x Mercedes IW356201 44 mm 12.6 mm — 32101
Pilot's Venturer Vertical Drive IW328601 44.4 mm 16.7 mm — 32722
Pilot's Watch Automatic 41 TOP GUN Lake Tahoe IW328104 41 mm 11.4 mm — 32112
Pilot's Watch Automatic TOP GUN IW326906 41 mm 11.4 mm 50.4 mm 32111
Pilot's Watch Mark XX IW328201 40 mm 10.8 mm 49 mm 32111
Pilot's Watch Mark XX Le Petit Prince (steel) IW328221 40 mm 10.8 mm — 32112
Big Pilot's Watch IW501015 46.2 mm 15.4 mm 56.1 mm 52111
Big Pilot's Watch Perpetual Calendar IW503605 46.2 mm 15.4 mm — 52616
Big Pilot's Watch 43 (titanium) IW329701Discontinued 43 mm 14.4 mm — 82100
Big Pilot's Watch TOP GUN Edition Mojave Desert IW506003 46 mm 14.6 mm — 52111
Pilot's Watch Mark XX Le Petit Prince (18 ct 5N gold) IW328301 40 mm 10.3 mm — 32112
Pilot's Watch Mark XX Mercedes-AMG Petronas Formula One IW328210 40 mm 10.6 mm — 32111
Big Pilot's Watch AMG G 63 (18 ct 5N gold) IW501201 46.2 mm 14.3 mm — 52011
Big Pilot's Watch Constant Force Tourbillon IW590503 46.2 mm 13.5 mm — 94800
Big Pilot's Watch Perpetual Calendar TOP GUN Ceratanium IW503604 46.2 mm 15.4 mm — 52616
Big Pilot's Watch AMG G 63 (ceramic) IW506201 46.5 mm 14.6 mm — 52011
Big Pilot's Watch Perpetual Calendar Ceralume IW505801 46.5 mm 15.9 mm — 52616
Big Pilot's Watch Perpetual Calendar TOP GUN Woodland IW503101 46.5 mm 15.5 mm 58.8 mm 52616
Big Pilot's Watch Perpetual Calendar Tourbillon Le Petit IW504901 46.5 mm 16.1 mm — 51950
Big Pilot's Watch Shock Absorber XPL IW357201Discontinued 44 mm 12 mm — 32115
Pilot's Watch Mark XVIII (ceramic) IW324702Discontinued 41 mm 11 mm 50.6 mm 30110
Pilot's Watch Automatic 36 Le Petit Prince IW458802 36 mm 9.9 mm — 32102
Pilot's Watch Mark XVIII IW327007Discontinued 40 mm 10.8 mm — 35111
Pilot's Watch Mark XVIII (steel, 10.8 mm thick, calibre 30110) IW327001Discontinued 40 mm 10.8 mm — 30110
Pilot's Watch Timezoner Edition Le Petit Prince IW395503 46 mm 15 mm — 82760
Big Pilot's Watch (steel) IW501012Discontinued 46.2 mm 15.5 mm — 52010
Big Pilot's Watch Annual Calendar IW502702Discontinued 46.2 mm 15.3 mm — 52850
Big Pilot's Watch Big Date IW510505Discontinued 46.2 mm 15.2 mm — 59235
Big Pilot's Watch (ceramic) IW502001Discontinued 46 mm 15.1 mm — 51111
Big Pilot's Watch Monopusher IW515204Discontinued 46 mm 14.6 mm 56 mm 59365
Pilot's Watch Timezoner TOP GUN Ceratanium IW395505 46 mm 15 mm — 82760
Pilot's Watch Timezoner TOP GUN Woodland IW395601 46 mm 15 mm — 82760
Big Pilot's Watch (18 ct red gold) IW500917Discontinued 46.2 mm 15.7 mm 56.1 mm 51111
Big Pilot's Watch Big Date Spitfire IW510506Discontinued 46.2 mm 15.2 mm — 59235
Big Pilot's Watch Constant-Force Tourbillon IW590302Discontinued 46.2 mm 13.5 mm — 94805
Big Pilot's Watch Constant-Force Tourbillon (titanium) IW590501Discontinued 46.2 mm 13.5 mm — 94800
Big Pilot's Watch Heritage (bronze) IW501005Discontinued 46.2 mm 15.4 mm — 52110
Big Pilot's Watch Heritage (titanium) IW501004Discontinued 46.2 mm 15.4 mm — 52010
Big Pilot's Watch Perpetual Calendar Tourbillon IW504803Discontinued 46.2 mm 16 mm — 51950
Big Pilot's Watch Perpetual Calendar (ceramic) IW503005Discontinued 46.5 mm 15.5 mm — 52615
Pilot's Watch Automatic 36 IW324001Discontinued 36 mm 10.4 mm — 35111

Other IWC Schaffhausen models

Watch Ø Thickness Lug-to-lug Calibre
Portofino Chronograph (calibre 75320) IW391036 42 mm 13.6 mm — 75320
Portofino Chronograph (calibre 79320) IW391027 42 mm 13.6 mm 49.3 mm 79320
Portugieser Tourbillon Chronograph IW394006 43.5 mm 15.9 mm — 89900
Portugieser Yacht Club Chronograph IW390701 44.6 mm 14.3 mm — 89361
Portugieser Chronograph IW371604 41 mm 13 mm 48 mm 69355
Portugieser Chronograph Ceratanium IW371631 41 mm 13 mm — 69355
Show 76 more
Watch Ø Thickness Lug-to-lug Calibre
Portugieser Yacht Club Chronograph (calibre 89361) IW390503Discontinued 43.5 mm 14.1 mm 53.5 mm 89361
Ingenieur Chronograph (calibre 69375) IW380801Discontinued 42.3 mm 14.9 mm — 69375
Da Vinci Perpetual Calendar Chronograph IW392104Discontinued 43 mm 15.7 mm — 89630
Da Vinci Chronograph IW393402Discontinued 42 mm 14.5 mm 53.7 mm 89361
Ingenieur Chronograph (calibre 69370) IW380702Discontinued 42 mm 15.2 mm — 69370
Portofino Chronograph 39 (steel, calibre 69355) IW391502 39 mm 13 mm — 69355
Portofino Chronograph 39 (steel, calibre 79350) IW391404 39 mm 12.7 mm — 79350
Portugieser Chronograph Classic IW390302Discontinued 42 mm 14.3 mm — 89361
Da Vinci Tourbillon Rétrograde Chronograph IW393101Discontinued 44 mm 16.8 mm — 89900
Ingenieur Chronograph Sport (15.1 mm thick) IW380901Discontinued 44.3 mm 15.1 mm — 89361
Ingenieur Chronograph Sport (16.3 mm thick) IW381201Discontinued 44.3 mm 16.3 mm — 69380
Portugieser Chronograph (steel, 40.9 mm) IW371445Discontinued 40.9 mm 12.5 mm 47.5 mm 79350
Portugieser Chronograph Rattrapante IW371222Discontinued 40.9 mm 12.4 mm 47.7 mm 76240
Ingenieur Automatic 42 IW338902 42 mm 11.5 mm — 82110
Ingenieur Perpetual Calendar 41 IW344904 41.6 mm 13.2 mm — 82600
Ingenieur Tourbillon 41 IW345901 41.6 mm 12.1 mm — 82905
Ingenieur Automatic 40 IW328702 40 mm 10.4 mm — 32111
Ingenieur Automatic 40 (titanium) IW328904 40 mm 10.8 mm — 32111
Aquatimer Automatic IW328801 42 mm 14.1 mm — 32111
Aquatimer Chronograph IW376803 44 mm 17 mm — 79320
Aquatimer Chronograph Edition Expedition Charles Darwin IW379503 44 mm 16.9 mm 52 mm 89365
Aquatimer Chronograph Edition Galapagos Islands IW379502 45 mm 16.9 mm — 89365
Ingenieur Perpetual Calendar Digital Date-Month IW381701Discontinued 45 mm 17.3 mm — 89801
Ingenieur Automatic IW357001Discontinued 40 mm 10.3 mm 48.5 mm 35111
Ingenieur Automatic 35 IW324901 35.1 mm 9.4 mm — 47110
Portugieser Automatic 42 IW501701 42.4 mm 13 mm — 52011
Portugieser Perpetual Calendar 42 IW344203 42.4 mm 13.8 mm 50.5 mm 82650
Aquatimer Automatic (42 mm, calibre 30120) IW329001Discontinued 42 mm 14.1 mm — 30120
Aquatimer Automatic (44 mm) IW341002Discontinued 44 mm 15.8 mm — 82110
Portugieser Hand-Wound Tourbillon IW545801 42.4 mm 10.8 mm — 81905
Portugieser Hand-Wound Tourbillon Day & Night IW545901 42.4 mm 10.8 mm — 81925
Portugieser Yacht Club Perpetual Calendar 42 IW344101 42.4 mm 14.1 mm — 82651
Portugieser Yacht Club Moon & Tide (steel) IW344002 44.6 mm 13.4 mm — 82836
Aquatimer Automatic 2000 IW329101Discontinued 42 mm 14.5 mm — 30120
Portugieser Perpetual Calendar IW503302 44.2 mm 14.9 mm 52.4 mm 52611
Portofino Complete Calendar IW359001 41 mm 11.7 mm — 32150
Portofino Hand-Wound Moon Phase IW516401 45 mm 13.1 mm 53 mm 59800
Portugieser Eternal Calendar IW505701 44.4 mm 14.9 mm — 52640
Portugieser Perpetual Calendar 44 IW503701 44.4 mm 15 mm — 52616
Portugieser Yacht Club Moon & Tide (18 ct 5N gold) IW344001 44.6 mm 13.4 mm 52.5 mm 82835
Portugieser Automatic 40 IW358303 40.4 mm 12.3 mm 49 mm 82200
Portofino Hand-Wound Eight Days IW510107 45 mm 11.7 mm — 59210
Portugieser Grande Complication IW377601 45 mm 16.5 mm — 79091
Portugieser Perpetual Calendar Tourbillon IW504505 45 mm 15.2 mm — 51950
Portofino Automatic IW356501 40 mm 9.2 mm 45 mm 35111
Portofino Automatic Moon Phase IW459401 40 mm 11.1 mm — 35800
Portofino Perpetual Calendar IW344601 40 mm 12.7 mm — 82650
Portugieser Hand-Wound Eight Days IW510212Discontinued 43.2 mm 12.3 mm 51.2 mm 59215
Portugieser Automatic IW500703Discontinued 42.3 mm 14.1 mm 50.3 mm 52010
Portugieser Sidérale Scafusia IW504101 46 mm 17.6 mm — 94900
Portofino Pointer Date IW359201 39 mm 10.7 mm — 35160
Portugieser Annual Calendar IW503501Discontinued 44.2 mm 14.9 mm — 52850
Portugieser Automatic Boutique IW500713Discontinued 42.3 mm 14.1 mm — 52010
Portugieser Minute Repeater IW544907Discontinued 44.2 mm 14 mm — 98950
Portugieser Perpetual Calendar (18 ct white gold, calibre 52610) IW503301Discontinued 44.2 mm 14.9 mm — 52610
Portugieser Perpetual Calendar (calibre 52615) IW503404Discontinued 44.2 mm 14.9 mm 52.3 mm 52615
Portugieser Tourbillon Mystère Rétrograde IW504601Discontinued 44.2 mm 14.9 mm — 51900
IWC Tribute to Pallweber IW505003Discontinued 45 mm 11.9 mm — 94200
Da Vinci Automatic IW358101Discontinued 40.4 mm 12.1 mm — 82200
Da Vinci Automatic (steel, 10.2 mm thick) IW356601Discontinued 40.4 mm 10.2 mm — 35111
Portofino Hand-Wound Tourbillon Rétrograde IW516501Discontinued 45 mm 14 mm — 59900
Portugieser Perpetual Calendar Digital Date-Month IW397204Discontinued 45 mm 16 mm 53.3 mm 89801
Portofino Automatic Moon Phase 37 IW459601 37.1 mm 11.3 mm — 32800
Portofino Automatic 34 IW357411 34 mm 8.6 mm — 35100
Portofino Automatic 34 (steel, 8.9 mm thick) IW657601 34 mm 8.9 mm — 35100
Portofino Automatic 37 (calibre 32111) IW458601 37 mm 9.4 mm — 32111
Portofino Automatic Day & Night 34 IW459801 34 mm 8.9 mm — 35180
Portugieser Hand-Wound Monopusher IW515301Discontinued 46 mm 13.9 mm — 59360
Aquatimer Perpetual Calendar Digital Date-Month IW379405Discontinued 49 mm 19.4 mm — 89802
Portugieser Constant-Force Tourbillon IW590202Discontinued 46 mm 13.4 mm — 94805
Da Vinci Automatic 36 IW458307Discontinued 36 mm 9.9 mm — 35111
Da Vinci Automatic Moon Phase 36 IW459307Discontinued 36 mm 11.6 mm — 35800
Portofino Automatic 37 (calibre 35111) IW458101Discontinued 37 mm 9.2 mm — 35111
Portofino Automatic Moon Phase 37 (steel) IW459008Discontinued 37 mm 10.8 mm — 35800
IWC Tribute to Pallweber (18 ct red gold, 52 mm) IW505101Discontinued 52 mm 14.2 mm — 94200
Portofino Automatic Moon Phase 37 (18 ct red gold) IW459009Discontinued 37 mm 10.8 mm — —

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