Answer first
The reference 323.10.44 sits inside the Omega Speedmaster Moonwatch Co-Axial Chronograph family: a 44.25 mm stainless steel case on a steel bracelet, with a two register dial and a date window at 6 o'clock. A replica speedmaster 323.10.44 is any copy built to match that specific reference. Quality runs from a $90 quartz novelty to a $600 automatic that reads correct on the wrist. The checks below tell you which one you are holding.
What the original reference is
The 323.10.44.51.01.001 uses a 44.25 mm steel case, roughly 16 mm thick, with 21 mm lugs. The crystal is sapphire and the caseback has a display window. Inside sits the caliber 9300 family movement, an automatic chronograph with a column wheel, a co-axial escapement and about 60 hours of power reserve. Water resistance is rated at 100 m. The dial is bicompax: running seconds at 9 o'clock, chronograph minutes at 3 o'clock, date at 6. There is no sub dial at 12.
Checks before you buy
- Measure the case across its widest point, left side to right side. You want 44.25 mm, not the 42 mm of the standard Moonwatch and not the 39.7 mm of the Reduced line.
- Look at the dial and count the sub dials. Two registers only, at 3 and 9. A third register near 12 or 6 marks a generic movement, not a copy of this reference.
- Find the date window. It belongs at 6 o'clock, cut into the dial, not printed on the outer track.
- Inspect the tachymeter scale on the bezel insert. The numerals and hash marks should be sharp and evenly spaced along the full arc.
- Start and stop the chronograph with each pusher. The reset should snap back to zero in one motion at every position you test.
- Turn the watch over and check the display back. Look at the rotor engraving, the balance wheel and the finish on the bridges. Worn or missing decoration is a sign of a low grade build.
- Check the bracelet end links against the lugs. They should seat with no gap and no rattle when you shake the watch.
- Weigh the watch. A steel 44.25 mm Moonwatch on a full bracelet lands near 190 g. A watch that feels half that weight is not steel inside.
Movement options in the replica market
Most automatic copies use an Asian 7750 base with a transfer plate so the sub dials land at 3 and 9. These run, but the pusher feel is firm rather than crisp and the rotor is loud. A smaller group uses a hand wound Seagull ST19 chronograph, which is thinner but lacks the automatic winding of the original. Quartz versions exist at the bottom of the market and give the sub dial spacing away, since the running seconds often tick once per second. Ask the seller which movement is fitted and expect the price to reflect it.
Fit and wear notes
The 44.25 mm case is wide and sits high on a small wrist, so measure your wrist before ordering. Anything under 6.75 inches will see the lugs overhang. The 21 mm lug width also limits strap swaps, since most aftermarket straps come in 20 or 22 mm.
Legal note
Counterfeit watches are illegal to sell in the United States and most of the European Union, and customs officers seize them at the border. Treat this guide as a reference for identifying what is on the market, not as advice on breaking the law where you live.