Omega Speedmaster Chronoscope vs Omega Speedmaster Professional

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

	Omega 329.30.43.51.02.001	Omega 310.30.42.50.01.002
Model	Speedmaster Chronoscope	Speedmaster Professional
Caliber	Omega Cal. 9908 -- manual-winding, 60h PR; Co-Axial escapement with a column wheel, twin barrels in series, silicon balance spring; Master Chronometer (METAS) certified, anti-magnetic to 15,000 gauss	Omega Cal. 3861 -- Co-Axial Master Chronometer, manual-wind, 21,600bph, 50h PR, 26j; cam-actuated chronograph, free-sprung balance with Si14 silicon hairspring, METAS-certified, anti-magnetic to 15,000 gauss
Case size	43mm	42mm
Lug-to-lug	48.6mm	46.2mm
Years produced	2021–present	2021–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	chronograph, sport	chronograph, sport
Editorial	n/a	yes
Typical price (2026)	n/a	$5,500 – $7,500
Service	n/a	Every 8 years · $600 – $900
Collector note	n/a	landmark: The Cal. 3861 Moonwatch is the only watch NASA has ever certified for extra-vehicular activity and remains in continuous production, making it the single most historically documented wristwatch in circulation.
Named dial variants	n/a	1 variant