Short answer
There is no single movement. A replica Constellation Co-Axial 1501 ships with one of four calibers, chosen by the factory and by the price tier: an Asian clone of the ETA 2824-2, a Swiss ETA 2824-2, a Miyota 9015, or a quartz caliber. The genuine Omega co-axial escapement is not one of them.
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Why the answer changes
Factories swap suppliers without notice. The same seller page can list two different calibers in the same month. Treat any movement name in a product listing as a claim, not a spec.
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The four calibers that show up most
1. Asian 2824-2 clone
Most common. Two Chinese makers supply most of these, Seagull and Hangzhou. Seagull lists the ST2130 at 28,800 vibrations per hour, 25 jewels, and a power reserve near 40 hours. It is a close copy of the ETA 2824-2 layout, so parts and service are easy to find.
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2. Swiss ETA 2824-2
ETA rates the 2824-2 at 28,800 vph, 25 jewels, and about 38 hours of power reserve. This is the top tier for a replica Constellation. Some listings say "Swiss ETA" and ship a Chinese copy, so ask for a photo of the balance and the rotor engraving.
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3. Miyota 9015
Japanese, made by Miyota. 28,800 vph, 24 jewels, about 42 hours of power reserve. It winds in one direction, so the rotor spins free when you turn the watch one way. That spin is a quick way to tell a 9015 from an ETA 2824-2, which winds both ways.
4. Quartz
Smaller cases, 33 mm to 35 mm, often run quartz. The second hand ticks once per second. There is no rotor and no balance wheel. Casebacks on these are thin, and the watch weighs less than the automatic versions.
What the real Omega uses
Omega put the co-axial escapement in a series watch in 1999 with Calibre 2500. Later Constellation models use Calibre 8500 and 8520, both with twin barrels. The escapement has three levels of contact instead of the two on a lever escapement. No replica copies that geometry. Some replicas add a stamped rotor and a decorated plate that reads "Co-Axial" on top of a Chinese base caliber.
About the number 1501
Omega case reference 1501 is a vintage Constellation from the 1960s. Those watches used Calibre 561 or 564, reported at 19,800 vph with 24 jewels. The co-axial escapement did not exist yet. A listing that joins "Co-Axial" and "1501" mixes two eras. Genuine Omega Constellation watches from the 2000s carry five-digit references such as 1501.20.00, and those do use co-axial calibers.
How to check the movement in hand
- Open the caseback. A plain Chinese base plate under a printed rotor is a deco cover.
- Count the balance. 28,800 vph equals 8 beats per second. Record it on a phone in slow motion.
- Turn the watch side to side. A rotor that freewheels one way points to a Miyota 9015.
- Watch the second hand. One tick per second means quartz.
What stays unknown
Factory names, batch numbers, and caliber swaps are not published. A seller listing "Co-Axial 1501" may not know which caliber is inside the case. Ask for a clear photo of the movement before you buy.