Replica Speedmaster 323.10.40: The Short Answer
The 323.10.40 is Omega's 40 mm steel Speedmaster Date, an automatic chronograph with a black dial, three subdials and a date at 3 o'clock. Replicas of it land between roughly $180 and $600 depending on movement and case work. The better ones get the 40 mm proportions and the dial layout right. The ones that get returned usually fail on three things: bracelet end links, crystal coating, and subdial spacing.
If you only remember one thing, remember this. This is not a Moonwatch. It is the smaller, thinner, date-wearing Speedmaster, and a replica that looks like a shrunken 42 mm Moonwatch is the wrong watch.
What the reference actually is
The genuine watch is a 40 mm stainless case, about 13 mm thick, on a three-link steel bracelet with mixed brushed and polished surfaces. The dial carries three subdials in a 12-6-9 layout, a date window at 3 with no magnifier over it, and a tachymeter bezel. Inside is a modular automatic chronograph, an ETA 2892 style base with a chrono module stacked on top, which is why the case stays slim compared to a Valjoux 7750 build.
That modular design matters when you shop. Most replicas use a 7750 clone, which is thicker, and you can feel it. The case sits taller on the wrist than the original and the date window often crowds the 3 o'clock subdial position.
Why it gets copied so much
- 40 mm suits more wrists than the 42 mm Professional, so the market is wider
- An automatic with a date is easier to live with daily than a manual wind
- It flies under the radar. Fewer people recognize it than a Moonwatch, which is part of the appeal
- Genuine examples are affordable enough that buyers study them closely, so the good replica factories bothered to copy it properly
Details worth inspecting in person
I look at the case flank first. On the original, the lugs curve down and the case sides have a distinct step between the polished and brushed zones. Replicas frequently soften that step or polish too much of the flank.
Next, the dial. Subdial spacing should match the genuine layout, with the running seconds at 9. Print weight matters more than people expect: the Omega logo, the tachymeter scale and the small text under the hands should all look sharp at arm's length, not fuzzy. A date font that is too bold is a common giveaway.
The bracelet is where most money gets saved. Check that end links sit flush against the case with no gap, that the clasp engraving is crisp, and that the links articulate without rattling. Then check the crystal. A good sapphire with a proper anti-reflective coat disappears at an angle. A cheap one reflects like a mirror.
Movements you will run into
Three groups show up in this reference. Entry builds use a basic 7750 clone with a rough rotor. Mid tier uses a better finished 7750 with a decorated rotor and closer date positioning. Top tier uses a 2892 clone with a chrono module, which gives the correct case thickness and the smoothest pusher feel. If the seller cannot tell you which one is inside, that is your answer.
Quick checklist before you pay
- Ask for a side profile photo. Thickness is the tell
- Ask for a macro shot of the date window and subdials
- Confirm pusher action: start, stop, reset should feel firm, not gritty
- Check the bracelet separately from the head
- Buy from a seller who shows the actual unit, not stock photos
Price follows those checks. A clean 2892-based build at $450 beats a $200 build with a fat case and a wobbly date every time.