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Omega · Speedmaster

Omega Speedmaster Moonwatch Professional Chronograph 42 mm (calibre 1863)

Reference 311.30.42.30.01.006 · Chronograph · 42 mm Discontinued

50030020015012010090807060Ø 42 mmLug-to-lug 48.2 mm
Illustration drawn from the specifications: case to scale, colours and style approximate. Not a photo. Photos on the official page

Specifications

Reference
311.30.42.30.01.006
Family
Speedmaster
Category
Chronograph
Status
Discontinued
Case material
Stainless steel
Case diameter
42 mm
Case thickness
13.45 mm Official
Lug-to-lug
48.2 mm Official
Lug width
20 mm Official
Water resistance
50 m
Bezel
Fixed, tachymetric scale
Calibre
1863 Official
Power reserve
48 h

Official product page · retrieved October 18, 2026

Does it fit your wrist?

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

50030020015012010090807060Lug-to-lug 48.2 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 48.2 mmCase diameter 42 mm
Side view, across the wrist

Comfortable

Lug-to-lug 48.2 mm on a flat top of 54.1 mm: 89 % of the width.

Lug-to-lug is 75 to 95% of the flat top, the usual comfortable range.

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
13.45 mm Official Omega October 18, 2026

Lug-to-lug

Value Type Source Date
48.2 mm Official Omega October 18, 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
20 mm Official Omega October 18, 2026

Calibre source

Official Omega · retrieved October 18, 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.

Other Speedmaster references

Watch Ø Thickness Lug-to-lug Calibre
Speedmaster Anniversary Series 42 mm 310.32.42.50.02.001 42 mm 14.47 mm 47.5 mm 3861
Speedmaster Moonwatch Professional (Hesalite) 310.30.42.50.01.001 42 mm 13.54 mm 47.5 mm 3861
Speedmaster Moonwatch Professional (sapphire) 310.30.42.50.01.002 42 mm 13.18 mm 47.5 mm 3861
Speedmaster Calibre 321 42 mm (platinum) 311.93.42.30.99.001 42 mm 13.39 mm 47.6 mm 321
Speedmaster Moonwatch Professional (Canopus gold) 310.60.42.50.02.001 42 mm 13.18 mm 47.5 mm 3861
Speedmaster Moonwatch Professional (Moonshine gold, black dial) 310.60.42.50.01.002 42 mm 13.63 mm 47.46 mm 3861
Speedmaster Moonwatch Professional (Moonshine gold) 310.60.42.50.10.001 42 mm 13.18 mm 47.46 mm 3861
Speedmaster Moonwatch Professional (Sedna gold) 310.60.42.50.01.001 42 mm 13.18 mm 47.5 mm 3861
Speedmaster Moonwatch Professional (steel and Moonshine gold) 310.20.42.50.02.001 42 mm 13.18 mm 47.5 mm 3861
Speedmaster Moonwatch Professional (steel and Sedna gold) 310.20.42.50.99.001 42 mm 13.18 mm 47.5 mm 3861
Speedmaster Chronoscope 43 mm 329.30.43.51.02.002 43 mm 12.8 mm 48.6 mm 9908
Speedmaster '57 40.5 mm 332.10.41.51.01.001 40.5 mm 12.99 mm 49.64 mm 9906
Speedmaster Moonphase 44.25 mm 304.30.44.52.01.001 44.25 mm 16.85 mm 50 mm 9904
Speedmaster Racing Chronograph 44.25 mm 329.30.44.51.01.001 44.25 mm 14.92 mm 50 mm 9900
Speedmaster Super Racing 329.30.44.51.01.003 44.25 mm 14.9 mm 50 mm 9920
Speedmaster Calibre 321 311.30.40.30.01.001 39.7 mm 13.7 mm 48 mm 321
Speedmaster First OMEGA in Space 310.30.40.50.06.001 39.7 mm 13.38 mm 48 mm 3861
Speedmaster Anniversary Series 42 mm (calibre 1861) 311.32.42.30.01.001Discontinued 42 mm 14 mm — 1861
Speedmaster Apollo 8 310.92.44.50.01.001 44.25 mm 12.97 mm 50 mm 3869
Speedmaster Dark Side of the Moon 44.25 mm 310.92.44.51.01.001 44.25 mm 13.02 mm 50 mm 9908
Speedmaster Dark Side of the Moon 44.25 mm (calibre 9900) 310.92.44.51.01.004 44.25 mm 15.09 mm 50 mm 9900
Speedmaster Dark Side of the Moon 44.25 mm (grey ceramic) 310.92.44.50.06.002 44.25 mm 12.97 mm 50 mm 3869
Speedmaster Moonwatch Chronograph 42 mm 311.30.42.30.01.004Discontinued 42 mm 13.8 mm 48.2 mm 1861
Speedmaster Moonwatch Professional Chronograph 42 mm (calibre 1861) 311.30.42.30.01.005Discontinued 42 mm 13.8 mm 48.2 mm 1861
Speedmaster Mark II Chronograph 42.4 × 46.2 mm 327.10.43.50.01.001Discontinued 42.4 mm 14.85 mm 46.2 mm 3330
Speedmaster '57 Chronograph 41.5 mm 331.10.42.51.01.001Discontinued 41.5 mm 16.17 mm 50 mm 9300
Speedmaster 38 mm 324.30.38.50.02.001 38 mm 14.7 mm 44.9 mm 3330
Speedmaster Calibre 321 38.6 mm (Canopus gold) 311.50.39.30.01.001 38.6 mm 13.92 mm 48 mm 321
Speedmaster 38 mm (steel and Sedna gold) 324.20.38.50.02.002 38 mm 14.75 mm 44.96 mm 3330
Speedmaster Date 40 mm 3210.50.00Discontinued 40 mm — — 1164
Speedmaster Day-Date 40 mm 3220.50.00Discontinued 40 mm — — 3606
Speedmaster Racing Chronograph 40 mm 326.30.40.50.01.001Discontinued 40 mm 15.05 mm — 3330
Speedmaster Moonwatch Chronograph 44.25 mm 311.30.44.50.01.002Discontinued 44.25 mm — — 3313
Speedmaster Anniversary Series Chronograph 39.7 mm 311.32.40.30.01.001Discontinued 39.7 mm 14 mm 47 mm 1861
Speedmaster Dark Side Of The Moon Chronograph 44.25 mm 311.92.44.51.01.003Discontinued 44.25 mm 16.14 mm 49.8 mm 9300
Speedmaster Date 39 mm 3513.50.00Discontinued 39 mm 14 mm — 1152
Speedmaster Reduced 39 mm (100 m) 3539.50.00Discontinued 39 mm — — 3220
Speedmaster Reduced 39 mm (30 m) 3510.50.00Discontinued 39 mm — — 3220
Speedmaster '57 Chronograph 38.6 mm 311.10.39.30.01.001Discontinued 38.6 mm — 48 mm 1861

Other Omega models

Watch Ø Thickness Lug-to-lug Calibre
Seamaster Diver 300M Chronograph 41.5 mm (calibre 1164) 2225.80.00Discontinued 41.5 mm — — 1164
Seamaster Diver 300M Chronograph 41.5 mm (calibre 3330) 212.30.42.50.01.001Discontinued 41.5 mm 16.67 mm 48.9 mm 3330
Seamaster Bullhead Chronograph 43 × 43 mm 225.12.43.50.04.001Discontinued 43 mm 14.85 mm 43 mm 3113
Seamaster Aqua Terra 150M Chronograph 44 mm 231.10.44.50.01.001Discontinued 44 mm 13.95 mm — 3313
Seamaster Diver 300M Chronograph 44 mm 212.30.44.50.01.001Discontinued 44 mm 17.27 mm 52 mm 3330
Seamaster Regatta Chronograph 46.75 mm (titanium) 216.92.46.79.10.001 46.75 mm 15.6 mm 50 mm 5701
Show 95 more
Watch Ø Thickness Lug-to-lug Calibre
Seamaster Planet Ocean 600M Chronograph 45.5 mm (calibre 9300) 232.30.46.51.01.001Discontinued 45.5 mm 19.25 mm 51.5 mm 9300
Seamaster Planet Ocean 600M Chronograph 45.5 mm (calibre 9900) 215.30.46.51.01.001Discontinued 45.5 mm 18.87 mm 52.3 mm 9900
Seamaster Diver 300M 42 mm 210.30.42.20.01.001 42 mm 13.56 mm 49.9 mm 8800
Seamaster Planet Ocean 600M 42 mm 217.30.42.21.01.003 42 mm 13.79 mm 47.5 mm 8912
Seamaster Diver 300M 42 mm (titanium, no date) 210.90.42.20.01.001 42 mm 13.48 mm 49.6 mm 8806
Seamaster 300 41 mm 234.30.41.21.01.001 41 mm 13.85 mm 48 mm 8912
Seamaster Aqua Terra 150M GMT Worldtimer 43 mm 220.10.43.22.03.001 43 mm 14.12 mm 50.3 mm 8938
Seamaster Railmaster 38 mm 235.12.38.20.06.001 38 mm 12.36 mm 44.92 mm 8806
Seamaster Railmaster 40 mm 220.10.40.20.01.001Discontinued 40 mm 12.65 mm 47 mm 8806
Seamaster Railmaster 39.2 mm 2503.52.00Discontinued 39.2 mm — — 2403
Seamaster Planet Ocean 42 mm 2201.50.00Discontinued 42 mm — — 2500
Seamaster Planet Ocean 600M 42 mm (calibre 8500) 232.30.42.21.01.001Discontinued 42 mm 15.8 mm — 8500
Seamaster Planet Ocean Ultra Deep 45.5 mm (O-MEGASTEEL) 215.30.46.21.03.001 45.5 mm 18.12 mm 51.9 mm 8912
De Ville Prestige Date Hand 42 mm (steel and Sedna gold) 434.20.42.22.02.001 42 mm 12.27 mm 48.95 mm 8936
De Ville Prestige Date Hand 42 mm (steel and yellow gold) 434.20.42.22.10.001 42 mm 12.27 mm 48.95 mm 8936
Seamaster 300 41 mm (calibre 8400) 233.30.41.21.01.001Discontinued 41 mm 14.65 mm 48 mm 8400
Seamaster 300 M 41 mm 2531.80.00Discontinued 41 mm — — 1120
Seamaster 300 M Quartz 41 mm 2264.50.00Discontinued 41 mm — — 1538
Seamaster Aqua Terra 150M GMT 43 mm 231.10.43.22.01.001Discontinued 43 mm 14.15 mm 51.4 mm 8605
Seamaster Diver 300M 41 mm 212.30.41.20.01.003Discontinued 41 mm 13.07 mm 47.4 mm 2500
Constellation 41 mm 131.30.41.21.04.001 41 mm 13.5 mm 44 mm 8900
De Ville Prestige 41 mm 434.13.41.21.03.002 41 mm 10.77 mm 47.89 mm 8810
Seamaster Aqua Terra 150M 41 mm 220.10.41.21.03.006 41 mm 13.26 mm 47.91 mm 8900
Seamaster Planet Ocean 600M GMT Worldtimer 45.5 mm 215.92.46.22.01.006 45.5 mm 17.38 mm 51.5 mm 8938
Seamaster Planet Ocean Ultra Deep 45.5 mm 215.92.46.21.01.001 45.5 mm 18.12 mm 55.96 mm 8912
Seamaster Planet Ocean 600M 43.5 mm 215.30.44.21.01.001Discontinued 43.5 mm 16.09 mm 49 mm 8900
Seamaster Planet Ocean 600M GMT 43.5 mm 215.30.44.22.01.001Discontinued 43.5 mm 17.04 mm 49.4 mm 8906
Seamaster Planet Ocean 600M GMT 43.5 mm (calibre 8605) 232.30.44.22.01.001Discontinued 43.5 mm 17.25 mm 49.2 mm 8605
Constellation 41 mm (steel and Sedna gold) 131.23.41.21.06.001 41 mm 13.45 mm 44 mm 8900
Constellation 41 mm (steel and yellow gold) 131.23.41.21.06.002 41 mm 13.45 mm 44 mm 8900
Constellation 41 mm (yellow gold) 131.63.41.21.01.001 41 mm 13.5 mm 44 mm 8901
De Ville Prestige Power Reserve 41 mm (Sedna gold) 434.53.41.21.02.001 41 mm 10.77 mm 47.89 mm 8810
De Ville Prestige Power Reserve 41 mm (steel and yellow gold) 434.20.41.21.02.001 41 mm 10.77 mm 47.89 mm 8810
De Ville Prestige Power Reserve 41 mm (yellow gold) 434.53.41.21.10.001 41 mm 10.77 mm 47.89 mm 8810
De Ville Tourbillon 43 mm (Canopus gold) 529.53.43.22.99.001 43 mm 12.7 mm 49.2 mm 2640
Seamaster Aqua Terra 150M 41 mm (Moonshine gold) 220.52.41.21.10.001 41 mm 13.37 mm 48.01 mm 8901
Seamaster Aqua Terra 150M 41 mm (Sedna gold) 220.52.41.21.03.001 41 mm 13.2 mm 47.9 mm 8901
Seamaster Aqua Terra 150M 41 mm (steel and Moonshine gold) 220.20.41.21.01.001 41 mm 13.4 mm 48 mm 8900
Seamaster Aqua Terra 150M 41 mm (steel and Sedna gold) 220.22.41.21.06.001 41 mm 13.2 mm 47.9 mm 8900
Seamaster 300 M Quartz 43.75 mm 2541.80.00Discontinued 43.75 mm — — 1538
De Ville Trésor 40 mm 435.13.40.21.02.001 40 mm 10.05 mm 44.8 mm 8910
De Ville Trésor Power Reserve 40 mm 435.13.40.22.01.001 40 mm 10.05 mm 44.8 mm 8934
De Ville Trésor Small Seconds 40 mm 435.13.40.21.03.002 40 mm 10.05 mm 44.8 mm 8926
Seamaster Planet Ocean 600M 39.5 mm 215.30.40.20.01.001Discontinued 39.5 mm 14.21 mm 45.6 mm 8800
Constellation Observatory 39.4 mm 140.13.39.21.02.001 39.4 mm 12.23 mm 47.2 mm 8914
De Ville Trésor Power Reserve 40 mm (yellow gold) 435.53.40.22.02.001 40 mm 10.65 mm 44.8 mm 8935
De Ville Trésor Small Seconds 40 mm (Sedna gold) 435.53.40.21.11.002 40 mm 10.65 mm 44.8 mm 8927
Constellation 39 mm 131.10.39.20.02.001 39 mm 12.43 mm 41 mm 8800
Seamaster Railmaster XXL 49.2 mm 2806.52.37Discontinued 49.2 mm — — 2201
Seamaster Aqua Terra Big Size 42.2 mm 2502.80.00Discontinued 42.2 mm — — 2500
Constellation Observatory 39.4 mm (Canopus gold) 140.53.39.21.99.004 39.4 mm 12.23 mm 47.2 mm 8915
Constellation Observatory 39.4 mm (Moonshine gold) 140.50.39.21.99.001 39.4 mm 12.23 mm 47.2 mm 8915
Constellation Observatory 39.4 mm (platinum and gold) 140.93.39.21.99.001 39.4 mm 12.32 mm 47.2 mm 8915
Constellation Observatory 39.4 mm (Sedna gold) 140.53.39.21.99.002 39.4 mm 12.23 mm 47.2 mm 8915
Seamaster Aqua Terra 150M 41.5 mm (calibre 8500) 231.10.42.21.01.001Discontinued 41.5 mm 12.95 mm 48.5 mm 8500
Seamaster Aqua Terra 150M 41.5 mm (calibre 8508) 231.10.42.21.01.002Discontinued 41.5 mm 12.95 mm 48.5 mm 8508
Seamaster Planet Ocean 600M 45.5 mm 232.30.46.21.01.001Discontinued 45.5 mm 16.6 mm 51.51 mm 8500
Seamaster Planet Ocean Big Size 45.5 mm 2200.50.00Discontinued 45.5 mm — — 2500
Constellation 39 mm (steel and Sedna gold) 131.20.39.20.02.001 39 mm 12.43 mm 41 mm 8800
Constellation 39 mm (steel and yellow gold) 131.20.39.20.02.002 39 mm 12.43 mm 41 mm 8800
Seamaster Aqua Terra 150M 38 mm 220.10.38.20.01.004 38 mm 12.26 mm 45.1 mm 8800
Seamaster Aqua Terra 150M 41 mm (previous model) 220.10.41.21.03.001Discontinued 41 mm 13.2 mm 47.9 mm 8900
Seamaster Aqua Terra Big Size 41 mm 2802.52.31Discontinued 41 mm — — 2403
Seamaster Aqua Terra Shades 38 mm 220.10.38.20.03.003 38 mm 12.26 mm 44.92 mm 8800
Seamaster Planet Ocean 600M 37.5 mm 232.30.38.20.01.001Discontinued 37.5 mm — 43.5 mm 8520
Seamaster Aqua Terra 150M 38 mm (Moonshine gold) 220.50.38.20.03.001 38 mm 12.26 mm 45.1 mm 8801
Seamaster Aqua Terra 150M 38 mm (steel and Moonshine gold) 220.20.38.20.10.002 38 mm 12.26 mm 45.1 mm 8800
Seamaster Aqua Terra Shades 38 mm (Moonshine gold) 220.53.38.20.10.001 38 mm 12.36 mm 45.1 mm 8801
Seamaster Aqua Terra Shades 38 mm (Sedna gold) 220.55.38.20.09.001 38 mm 12.26 mm 45.1 mm 8801
Seamaster Aqua Terra Shades 38 mm (steel and Moonshine gold) 220.20.38.20.02.002 38 mm 12.36 mm 45.1 mm 8800
Seamaster Aqua Terra Shades 38 mm (steel and Sedna gold) 220.20.38.20.09.001 38 mm 12.36 mm 45.1 mm 8800
Seamaster 300 M Mid Size 36.25 mm 2551.80.00Discontinued 36.25 mm — — 1120
Seamaster Diver 300M 36.25 mm 212.30.36.20.03.001Discontinued 36.25 mm 12.65 mm — 2500
Seamaster Aqua Terra 39.2 mm 2503.80.00Discontinued 39.2 mm — — 2500
Seamaster Aqua Terra Quartz 39.2 mm 2517.80.00Discontinued 39.2 mm — — 1538
Constellation 29 mm 131.15.29.20.60.001 29 mm 12 mm 31.2 mm 8700
Constellation Quartz 36 mm 131.10.36.60.01.001 36 mm — 39.1 mm 4564
Constellation Small Seconds 34 mm 131.10.34.20.02.001 34 mm 11.7 mm 37 mm 8802
De Ville Ladymatic 34 mm 425.30.34.20.55.002 34 mm 11.95 mm 41.6 mm 8520
De Ville Mini Trésor Quartz 26 mm 428.17.26.60.04.008 26 mm 7.46 mm 31.13 mm 4061
De Ville Trésor Quartz 36 mm 428.17.36.60.04.001 36 mm 8.85 mm 42.7 mm 4061
Seamaster Aqua Terra 150M 30 mm 220.10.30.20.02.001 30 mm 10.55 mm 36.5 mm 8750
Seamaster Aqua Terra 150M 38.5 mm 231.10.39.21.01.002Discontinued 38.5 mm 12.84 mm 45.5 mm 8500
Constellation 29 mm (steel and Moonshine gold) 131.25.29.20.58.002 29 mm 12 mm 31.2 mm 8700
Constellation 29 mm (steel and Sedna gold) 131.25.29.20.52.003 29 mm 12 mm 31.2 mm 8700
Constellation Quartz 36 mm (steel and yellow gold) 131.20.36.60.02.002 36 mm — 39.1 mm 4564
Constellation Small Seconds 34 mm (Sedna gold) 131.58.34.20.61.001 34 mm 11.7 mm 36.9 mm 8803
Constellation Small Seconds 34 mm (steel and Sedna gold) 131.20.34.20.63.001 34 mm 11.7 mm 37 mm 8802
De Ville Ladymatic 34 mm (steel and Sedna gold) 425.20.34.20.55.004 34 mm 11.95 mm 41.6 mm 8520
De Ville Mini Trésor Quartz 26 mm (Moonshine gold) 428.57.26.60.04.004 26 mm 7.46 mm 31.13 mm 4061
De Ville Trésor Quartz 36 mm (Moonshine gold) 428.57.36.60.04.001 36 mm 8.85 mm 42.7 mm 4061
Constellation 38 mm 123.10.38.21.01.001Discontinued 38 mm 12.52 mm 41.7 mm 8500
Seamaster Aqua Terra 150M 38 mm (previous model) 220.10.38.20.03.001Discontinued 38 mm 12.24 mm 45 mm 8800
Seamaster Aqua Terra Mid Size 36.2 mm 2504.80.00Discontinued 36.2 mm — — 2500
Constellation 35 mm 123.10.35.20.01.001Discontinued 35 mm 10.76 mm 38.4 mm 2500

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