Is this the Moonwatch?

Yes. The Speedmaster Professional is the Moonwatch, the hand-wound chronograph that NASA flight-qualified in 1965 and that went to the Moon in 1969. The automatic Speedmasters (Racing, Moonphase, Dark Side) are different watches.

Is this new or pre-owned?

It is a regular Amazon listing from a marketplace seller, not a Luxury Stores pre-owned unit. The rows we read do not state the condition or whether Omega’s five-year warranty card is included; ask the seller before buying.

Is an Omega on Amazon authentic?

It is sold by a marketplace seller with Amazon’s 30-day return window. Amazon does not authenticate the watch; ask the seller for the warranty card and have it checked inside the window.

Omega · Speedmaster Moonwatch · 3861 · sapphire front and back · bracelet · on Amazon

The Moonwatch with sapphire on both sides.

This is the Speedmaster Professional for people who want to see the movement: the same 42mm asymmetric steel case, black step dial, black tachymeter bezel with the dot over ninety and five-arch-link bracelet as the hesalite watch, but with a domed sapphire crystal in front and a sapphire caseback behind, through which you can watch the calibre 3861 at work. The 3861 is Omega’s hand-wound Co-Axial chronograph, certified as a Master Chronometer by METAS, with about 50 hours of reserve. Sapphire does not scratch, and the caseback version is a millimetre thinner. Sold on Amazon by a marketplace seller shipping from Japan, with two left when we read it.

This Moonwatch on Amazon$5,000–$10,000 band

Illustrative render — hero view of the Omega Speedmaster Moonwatch Professional Co-Axial Master Chronometer 42mm 310.30.42.50.01.002 (sapphire, steel bracelet)

Case

42mm, 13.18mm thick, 47.5mm lug to lug, 20mm lugs, steel asymmetric case, black aluminium tachymeter bezel, sapphire caseback, 50m

Photograph; Omega 310.30.42.50.01.002

Movement

Omega Co-Axial Master Chronometer calibre 3861, hand-wound chronograph, METAS certified, about 50 h

Omega

Crystal

Domed sapphire, anti-reflective inside; sapphire caseback

Omega

Bracelet

Steel, five arched links per row, foldover clasp with comfort setting; 138 g

Photograph; Omega

Reference

310.30.42.50.01.002

Model row and seller description

Seller

MS-TR JAPAN, marketplace seller shipping from Japan; only 2 left; 30-day returns; 3 ratings when read; condition not stated

Amazon buy box, 2026-09-14

Sapphire sandwich

The Moonwatch is the Speedmaster Professional, the hand-wound chronograph NASA qualified for spaceflight in 1965 and Buzz Aldrin wore on the Moon in 1969. Its shape has not changed: a 42mm asymmetric steel case with twisted lyre lugs, a black tachymeter bezel, a black dial with three sub-dials, and a crown between two pushers. What Omega changes, every couple of decades, is what is inside and what is on top. This reference is the 2021 watch with the crystal purists argue about swapped for sapphire, front and back. The front is domed to keep the hesalite look; the back is a window onto the 3861, with its rhodium-plated bridges, column wheel and Co-Axial escapement.

Sapphire does not scratch in normal wear and the caseback version is slightly thinner, at 13.18mm against 13.54mm. What you give up is the 1969 look of the acrylic dome and the exact NASA spec, which is why Omega sells both and why the two are on this page side by side.

Illustrative render — sapphire sandwich of the Omega Speedmaster Moonwatch Professional Co-Axial Master Chronometer 42mm 310.30.42.50.01.002 (sapphire, steel bracelet)

Reading the listing

The listing’s title is just the brand; the model row and the seller’s description carry the full reference, 310.30.42.50.01.002. The photograph shows the asymmetric case, the black bezel, the step dial and the arched-link bracelet. The case size, thickness, lug figures, sapphire crystal and caseback, calibre 3861, its METAS certification, reserve and 50 metres are Omega’s published figures for the reference.

The seller is MS-TR JAPAN, a marketplace seller shipping from Japan with two left when we read it, and the rows we read do not state whether the watch is new with Omega’s five-year warranty; ask, and ask for the box and card. Nothing here was measured on the watch.

Illustrative render — reading the listing of the Omega Speedmaster Moonwatch Professional Co-Axial Master Chronometer 42mm 310.30.42.50.01.002 (sapphire, steel bracelet)

Buying it on Amazon

This is a regular Amazon listing from a marketplace seller with Amazon’s 30-day return window; it is not a Luxury Stores pre-owned unit and the seller has not published a condition. The second button opens the live search for sapphire Moonwatches in case this one has sold.

Speedmasters have resold for under new and close to what pre-owned buyers paid, sometimes more, sometimes less; that is a pattern, not a promise, and nothing here is investment advice.

Illustrative render — buying it on amazon of the Omega Speedmaster Moonwatch Professional Co-Axial Master Chronometer 42mm 310.30.42.50.01.002 (sapphire, steel bracelet)

Specs

Reference: 310.30.42.50.01.002
Case size: 42mm, 13.18mm thick, 47.5mm lug to lug, 20mm lugs
Case material: Stainless steel, polished and brushed asymmetric case, black anodised aluminium tachymeter bezel with the dot over ninety, solid caseback with the Seahorse
Movement: Omega Co-Axial Master Chronometer calibre 3861, hand-wound chronograph, METAS certified, silicon balance spring
Caliber type: Omega 3861, Master Chronometer
Crystal: Domed sapphire, anti-reflective inside; sapphire caseback
Water resistance: 50m (5 bar)
Power reserve: About 50 hours
Complications: Chronograph, small seconds, tachymeter
Origin: Swiss Made

Specifications as published by Omega. We research from manufacturer documentation and published sources rather than hands-on testing. Researched 2026-09-13.

Verdict

The current Moonwatch with sapphire front and back on the bracelet and the 3861 Master Chronometer, on Amazon from a Japanese marketplace seller: the Speedmaster Professional with the movement on show, reference on the listing.

Strengths

Calibre 3861 Master Chronometer, visible through the sapphire caseback
Sapphire crystal; no scratches to polish
Thinner than the hesalite version at 13.18mm
Full reference on the listing; Amazon’s return window

Trade-offs

Ships from Japan; condition and warranty not stated, ask
Not the NASA-spec crystal, if that matters to you
50 metres; not for swimming
Only two in stock when read

Buy it if

Someone who wants the Moonwatch and wants to watch the chronograph work.

Skip it if

You want the hesalite dome, an automatic, or a stated warranty.

This Moonwatch on Amazon$5,000–$10,000 band

FAQ

Hesalite is the acrylic crystal of the original, domed, scratchable, polishable and shatterproof. Sapphire does not scratch and this version adds a sapphire caseback. Omega makes both; the movement is the same 3861.

Compare

OmegaSpeedmaster Moonwatch Professional Co-Axial Master Chronometer 42mm 310.30.42.50.01.002 (sapphire, steel bracelet) vs Speedmaster Moonwatch Professional Co-Axial Master Chronometer 42mm 310.30.42.50.01.001 (hesalite, steel bracelet)

OmegaSpeedmaster Moonwatch Professional Co-Axial Master Chronometer 42mm 310.30.42.50.01.002 (sapphire, steel bracelet) vs Speedmaster Moonwatch Professional 42mm 311.33.42.30.01.002 (calibre 1863, sapphire front and back, black leather strap)

OmegaSpeedmaster Moonwatch Professional Co-Axial Master Chronometer 42mm 310.30.42.50.01.002 (sapphire, steel bracelet) vs Speedmaster Moonphase Co-Axial Master Chronometer Chronograph 44.25mm 304.33.44.52.01.001 (steel, black dial, black alligator strap)

Sources

Researched and last updated 2026-09-13. We do not test watches in hand; every figure above is traceable to the manufacturer or the sources listed here.

Omega Speedmaster Moonwatch Professional Co-Axial Master Chronometer 42mm 310.30.42.50.01.002 (sapphire, steel bracelet)

Reference 310.30.42.50.01.002 · $5,000–$10,000

This Moonwatch on Amazon

Prices and availability change; the band above is a research figure, so check the current listing.

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