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The 2021 Omega Speedmaster Moonwatch Professional generation brought Calibre 3861 to the Moonwatch. One verified configuration, reference 310.30.42.50.01.001, pairs the movement with a 42 mm stainless-steel case and bracelet, a Hesalite crystal, and a black dial. Omega’s current product information lists a 50-hour power reserve, 5 bar water resistance, and Master Chronometer certification for this reference.
What is the 2021 Speedmaster 3861?
It is the Speedmaster Moonwatch Professional generation associated with Omega’s hand-wound Calibre 3861. The available official specifications confirm the details of reference 310.30.42.50.01.001, rather than a complete catalogue of every configuration offered at the 2021 introduction. Omega’s later 2024 announcement of a white-dial Moonwatch also identifies a 42 mm steel watch powered by Calibre 3861; that later release is collection context, not proof of the 2021 launch lineup. Omega’s 2024 white-dial announcement
Reference 310.30.42.50.01.001: verified specifications
Omega’s product sheet identifies this as a steel Speedmaster Moonwatch Professional with a Hesalite crystal and steel bracelet. These figures apply to this reference; they should not be treated as specifications for every 3861 Moonwatch.
| Specification | Reference 310.30.42.50.01.001 |
|---|---|
| Case material and diameter | Stainless steel; 42 mm |
| Crystal | Hesalite |
| Bracelet | Stainless steel |
| Movement | Calibre 3861, Master Chronometer |
| Power reserve | 50 hours |
| Water resistance | 5 bar (50 m / 165 ft) |
| Lug spacing | 20 mm |
| Magnetic resistance | Above 15,000 gauss, as described in Omega’s product sheet and attributed there to METAS testing |
Specifications are from Omega’s product page for reference 310.30.42.50.01.001, accessed in 2026. The cited page is published by Omega Korea.
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What Master Chronometer means here
Omega’s manual explains that Master Chronometer testing addresses precision, magnetic resistance, power reserve, and water resistance. It also states that the movement meets the chronometer criteria of ISO 3159. The product sheet’s above-15,000-gauss statement is specific to the cited watch and attributes the resistance result to METAS testing; it is not a guarantee against every magnetic exposure or a substitute for the watch’s instructions.
For the certification and care context, see Omega’s user manual.
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Hesalite or sapphire: what can be confirmed?
For reference 310.30.42.50.01.001, Omega lists Hesalite. The material available here does not establish the specifications or reference numbers for a sapphire version in the 2021 collection, so it cannot support a full Hesalite-versus-sapphire comparison. Check the exact reference on Omega’s product page before comparing crystal, caseback, or other configuration details.
What the available details do not establish
The official material cited here does not establish the original 2021 announcement’s complete reference list, launch prices, regional availability, or total number of variants. Nor does the 2024 white-dial release establish which configurations belonged to the original 2021 launch. Buyers comparing listings should match the reference number, crystal, bracelet, and condition rather than relying on “3861” alone.
Warranty and ownership
Omega’s manual describes a five-year international warranty for new timepieces purchased from 1 July 2018, subject to its conditions and restrictions. That wording does not by itself confirm coverage for a particular used watch, resale, or purchase; check the watch’s warranty documents and the terms applicable to its original sale.
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