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Omega · Speedmaster

Omega Speedmaster Moonphase 44.25 mm

Reference 304.30.44.52.01.001 · Chronograph · 44.25 mm

50030020015012010090807060Ø 44.25 mmLug-to-lug 50 mm
Illustration drawn from the specifications: case to scale, colours and style approximate. Not a photo. Photos on the official page

Specifications

Reference
304.30.44.52.01.001
Family
Speedmaster
Category
Chronograph
Status
Current
Case material
Stainless steel
Case diameter
44.25 mm
Case thickness
16.9 mm Official
Lug-to-lug
50 mm Official
Lug width
21 mm Official
Water resistance
100 m
Bezel
Fixed, tachymetric scale
Certifications
METAS Master Chronometer
Calibre
9904 Official
Power reserve
60 h
Frequency
28,800 vph (4 Hz)

Official product page · retrieved October 14, 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 50 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 50 mmCase diameter 44.3 mm
Side view, across the wrist

Comfortable

Lug-to-lug 50 mm on a flat top of 54.1 mm: 92 % 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
16.85 mm Official Omega October 14, 2026

Lug-to-lug

Value Type Source Date
50 mm Official Omega October 14, 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 Omega October 14, 2026

Calibre source

Official Omega · retrieved October 14, 2026

Other Speedmaster references

Watch Ø Thickness Lug-to-lug Calibre
Speedmaster Super Racing 329.30.44.51.01.003 44.25 mm 14.9 mm 50 mm 9920
Speedmaster Apollo 8 310.92.44.50.01.001 44.25 mm 13 mm 50 mm 3869
Speedmaster Dark Side of the Moon 44.25 mm 310.92.44.51.01.001 44.25 mm 13 mm 50 mm 9908
Speedmaster Chronoscope 43 mm 329.30.43.51.02.002 43 mm 12.8 mm 48.6 mm 9908
Speedmaster Moonwatch Professional (Hesalite) 310.30.42.50.01.001 42 mm 13.5 mm 47.5 mm 3861
Speedmaster Moonwatch Professional (sapphire) 310.30.42.50.01.002 42 mm 13.2 mm 47.5 mm 3861
Speedmaster '57 40.5 mm 332.10.41.51.01.001 40.5 mm 13 mm 49.6 mm 9906
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 13.4 mm 48 mm 3861
Speedmaster 38 mm 324.30.38.50.02.001 38 mm 14.7 mm 44.9 mm 3330

Other Omega models

Watch Ø Thickness Lug-to-lug Calibre
Seamaster Aqua Terra 150M GMT Worldtimer 43 mm 220.10.43.22.03.001 43 mm 14.1 mm 50.3 mm 8938
Seamaster Planet Ocean Ultra Deep 45.5 mm 215.92.46.21.01.001 45.5 mm 18.1 mm 56 mm 8912
Seamaster Diver 300M 42 mm 210.30.42.20.01.001 42 mm 13.6 mm 49.9 mm 8800
Seamaster Planet Ocean 600M 42 mm 217.30.42.21.01.003 42 mm 13.8 mm 47.5 mm 8912
Seamaster Railmaster 38 mm 235.12.38.20.06.001 38 mm 12.4 mm 44.9 mm 8806
Seamaster 300 41 mm 234.30.41.21.01.001 41 mm 13.9 mm 48 mm 8912
Show 9 more
Watch Ø Thickness Lug-to-lug Calibre
Seamaster Planet Ocean 600M 43.5 mm 215.30.44.21.01.001 43.5 mm 16.1 mm 49 mm 8900
Seamaster Planet Ocean 600M GMT 43.5 mm 215.30.44.22.01.001 43.5 mm 17 mm 49.4 mm 8906
Seamaster Railmaster 40 mm 220.10.40.20.01.001 40 mm 12.7 mm 47 mm 8806
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 10.8 mm 47.9 mm 8810
Seamaster Planet Ocean 600M 39.5 mm 215.30.40.20.01.001 39.5 mm 14.2 mm 45.6 mm 8800
Constellation Observatory 39.4 mm 140.13.39.21.02.001 39.4 mm 12.2 mm 47.2 mm 8914
Seamaster Aqua Terra 150M 41 mm 220.10.41.21.03.001 41 mm 13.2 mm 47.9 mm 8900
Seamaster Aqua Terra 150M 38 mm 220.10.38.20.03.001 38 mm 12.2 mm 45 mm 8800

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