Constellation Observatory 39.4

Ref. 140.13.39.21.02.001

Case diameter: 39.4 mm; Manufacturer spec
Lug-to-lug: 47.2 mm; Manufacturer spec
Thickness: 12.2 mm; Manufacturer spec
Lug width: 19 mm; Manufacturer spec

Retail price $10,900 (US, Oct 2026)

Your wristIdeal fit

Wrist flat: 55.1 mmLug-to-lug: 47.2 mm

How the Constellation Observatory 39.4 wears

Its lugs add 7.8 mm to the 39.4 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 6.5" to 7.75" (16.5–19.7 cm); below 6.5" the lugs start to reach the edge of the wrist.

At 12.2 mm thick it is thicker than 77% of the 75 other dress watches we've measured, so expect it to sit tall on the wrist.

Its 19 mm lug width is one of the most common strap sizes; 27 other watches here share it, so aftermarket straps are easy to find.

Will the Constellation Observatory 39.4 fit your wrist?

With a 47.2 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	Ideal fit
7"	55.1 mm	Ideal fit
7.5"	59.1 mm	Ideal fit
8"	63 mm	Wears small

Specifications

Reference: 140.13.39.21.02.001
Collection: Constellation
Status: In production
Case material: O-MEGASTEEL
Crystal: sapphire
Water resistance: 30 m
Bezel: faceted steel
Dial: silver
Strap / bracelet: dark grey alligator strap, steel pin buckle
Style: Dress

Movement

Caliber: Omega 8914
Type: automatic
Power reserve: 60 hours
Accuracy: 0/+5 s/day (METAS Master Chronometer)

Takes 19 mm straps. See other 19 mm watches and straps.

More Constellation references

Watches that wear the same size

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

Same 19 mm lug width

All 19 mm watches

These take the same straps as the Constellation Observatory 39.4.