Side-by-side at a glance. Click a watch above to open the full reference page.

	Omega 123.10.39.21.02.001	Omega 131.20.41.41.06.001
Model	Constellation Co-Axial 39mm	Constellation, Modern 41mm
Caliber	Omega Cal. 8600 -- Co-Axial Master Chronometer automatic, 25,200bph, 55h PR, 30j; METAS-certified, anti-magnetic to 15,000 gauss	Omega Cal. 8501 -- Co-Axial Master Chronometer automatic, 25,200bph, 60h PR, 30j; METAS-certified, anti-magnetic; used in Constellation Modern 41
Case size	39mm	41mm
Lug-to-lug	46mm	47mm
Years produced	2015–present	2015–present
Brand tier	luxury	luxury
Era	modern	modern
Movement tier	In-house manufacture	In-house manufacture
Market median (excellent / full-set)	n/a	n/a
Typical range	n/a	n/a
Confidence	low	low
Categories	dress, sport	dress, sport
Editorial	n/a	yes

Omega Constellation Co-Axial 39mm vs Omega Constellation, Modern 41mm