Speedmaster Moonwatch Professional 42

Ref. 311.30.42.30.01.005

Case diameter: 42 mm; Manufacturer spec
Lug-to-lug: 48.2 mm; Manufacturer spec
Thickness: 13.8 mm; Manufacturer spec
Lug width: 20 mm; Manufacturer spec

Your wristIdeal fit

Wrist flat: 55.1 mmLug-to-lug: 48.2 mm

How the Speedmaster Moonwatch Professional 42 wears

Its lugs add 6.2 mm to the 42 mm case, close to the 7 mm typical across the almanac, so its diameter is a fair guide to how it wears.

On our fit model it sits best on wrists from 6.75" to 8" (17.1–20.3 cm); below 6.75" the lugs start to reach the edge of the wrist.

At 13.8 mm thick it is thicker than 64% of the 47 other chronograph watches we've measured, so expect it to sit tall on the wrist.

Its 20 mm lug width is one of the most common strap sizes; 186 other watches here share it, so aftermarket straps are easy to find.

Will the Speedmaster Moonwatch Professional 42 fit your wrist?

With a 48.2 mm lug-to-lug, here is how it wears across common wrist sizes. We estimate the flat top of each wrist from its circumference; measure yours for a closer answer in the fit finder.

Wrist	Flat width (est.)	Fit
6"	47.2 mm	Lugs overhang
6.5"	51.2 mm	Snug, lugs near the edge
7"	55.1 mm	Ideal fit
7.5"	59.1 mm	Ideal fit
8"	63 mm	Ideal fit

Specifications

Reference: 311.30.42.30.01.005
Collection: Speedmaster
Status: Discontinued
Introduced: 2014
Case material: stainless steel
Crystal: hesalite
Water resistance: 50 m
Bezel: fixed black aluminium tachymeter bezel
Dial: black
Strap / bracelet: stainless steel bracelet
Style: Chronograph

Movement

Caliber: Omega 1861
Type: manual
Power reserve: 48 hours

Takes 20 mm straps. See other 20 mm watches and straps.

More Speedmaster references

Watches that wear the same size

Other watches within 1.5 mm of its lug-to-lug.

Same 20 mm lug width

All 20 mm watches

These take the same straps as the Speedmaster Moonwatch Professional 42.