The Omega Seamaster Professional 300M reference 2220.80.00 is a 41 mm stainless-steel diver with a blue dial, Omega’s automatic calibre 2500 and 300 m water resistance. Set against its predecessor, the 2531.80.00, the one difference Omega’s own listings document is the movement: calibre 1120 in the older reference, calibre 2500 in the newer one. Where the 2220.80.00 sits in the model’s timeline comes from specialist reporting, not from Omega, so this article keeps those two kinds of evidence apart.
What Omega’s product pages confirm for the 2220.80.00
Two of Omega’s localized product pages describe this reference. The Japan page is the more detailed of the two, and the Hong Kong page adds the dial description. Taken together, they give the following specifications.
| Attribute | Omega 2220.80.00 value | Where Omega states it |
|---|---|---|
| Case material and diameter | Stainless steel, 41 mm | Omega Japan product page |
| Dial | Blue; wave-pattern dial with date window at 3 o’clock | Omega Hong Kong product page |
| Lug width | 20 mm | Omega Japan product page |
| Water resistance | 300 m / 1000 ft | Omega Japan product page |
| Movement | Omega automatic calibre 2500, described as a rhodium-plated automatic chronometer with Co-Axial escapement | Omega Japan product page |
| Power reserve | 48 hours | Omega Japan product page |
These are the figures to use when checking a watch against the reference. Dimensions and movement are manufacturer facts; the Hong Kong listing’s description of the dial is the only official statement of the wave pattern and date position in this set.
2531.80.00 versus 2220.80.00: what changed
Omega’s listing for the 2531.80.00 confirms calibre 1120 and 300 m water resistance. It is the official basis for the movement distinction, and it is the only Omega-sourced comparison point for the predecessor in this article. The table separates what each source supports.
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| Comparison point | 2531.80.00 | 2220.80.00 | Basis |
|---|---|---|---|
| Movement | Calibre 1120 | Calibre 2500 | Omega listings for both references |
| Water resistance | 300 m | 300 m / 1000 ft | Omega listings for both references |
| Case diameter and lug width | Not stated in the Omega listing consulted for this article | 41 mm; 20 mm | Omega Japan product page for 2220.80.00 |
| Power reserve | Not stated in the Omega listing consulted for this article | 48 hours | Omega Japan product page for 2220.80.00 |
| Dial furniture | Not stated in the sources consulted | Applied dial furniture alongside the Co-Axial calibre 2500 | Omega Forums Stories, specialist secondary reporting |
| Release period | Predecessor; replaced in the mid-2000s | Around 2006, described as a transitional model | Worn & Wound owner review and Omega Forums Stories, both secondary |
The movement change is the only difference the official pages establish. The dial and timing differences are real enough to be discussed, but they come from owners and collectors writing about the watches, not from Omega.
Why the 2220.80.00 is called a transitional reference
The launch date is secondary reporting
A Worn & Wound owner review dates the 2220.80.00 to 2006 and calls it a transitional model. Omega Forums Stories describes the 2531.80 giving way to the 2220.80 in the mid-2000s. The two accounts agree on the period. Neither is an Omega chronology, and Omega’s current product pages do not state a launch year for this reference.
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The movement architecture is a reporting claim too
The same Worn & Wound review says calibre 2500 is based on ETA 2892 architecture. Omega’s page confirms the calibre number and the Co-Axial escapement, but it does not describe the calibre’s base. Treat the ETA 2892 link as the reviewer’s reading.
What “transitional” means for a buyer
A transitional reference is one that carries features from the outgoing version alongside newer ones. For the 2220.80.00, the documented new feature is the movement, and the older-generation traits are the ones described in specialist coverage. That framing is useful for understanding why two watches with the same case family can differ, but it is an interpretation of the change, not a catalogued list of revisions.
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How to check a 2220.80.00 on its own terms
- Reference: Match the reference against Omega’s listing for 2220.80.00 before comparing anything else. A 2531.80.00 or another diver reference can look similar at a glance.
- Movement: The official calibre for this reference is 2500. A seller’s description that gives a different calibre is a reason to ask for documentation before paying.
- Dial and case: Compare the blue dial, the date window at 3 o’clock, the 41 mm case and the 20 mm lug width with Omega’s published values.
- Service and originality: Ask for service records and check whether the parts are original. These affect the watch’s condition, but this article does not state service intervals or repair costs.
Is the mid-cycle reference worth choosing?
The 2220.80.00 makes sense if you want a blue-dial 41 mm Seamaster Professional 300M with a calibre that Omega itself documents as calibre 2500, and you are comfortable with the older-generation story being based on secondary reporting. Its position between two generations is the part of its appeal that rests on specialist coverage. The official specifications support the watch as a 300 m diver; they do not on their own make it the better or the rarer of the two references.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What this article does not establish
This article does not state current resale value, condition-adjusted pricing, inventory, or whether a particular seller’s example is authentic. It also does not give the 2531.80.00’s case dimensions, because the Omega listing consulted did not state them. Check current listings and the seller’s paperwork at the time of purchase.
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Use the official reference, movement and dial specifications in this article when you compare examples, and treat the launch timing and design history as context rather than fact.
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