CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeOmega 2500 — Heritage family: 20 calibers, 19 sourced lineage links.Drag to explore.
100%drag to pan · hover a caliber to isolate its line · scroll the page normallyopen the full family view →
derived frommodule onderived fromderived fromderived frommodule onderived frommodule onclone ofclone ofderived fromvariant ofvariant ofvariant ofvariant ofvariant ofvariant ofébauche ofébauche ofETA 2890A9 (2892A2) — open caliber pageETA 2890A9 (2892A2)1999ETA SA Manufacture Horlogère…1 exec · grade ?ETA 2891A9 (2892A2) — open caliber pageETA 2891A9 (2892A2)1999ETA SA Manufacture Horlogère…1 exec · grade ?ETA 2892-A2 — open caliber pageETA 2892-A2—ETA SA Manufacture Horlogère…3 exec · grade ?ETA 2893-1 (2892A2) — open caliber pageETA 2893-1 (2892A2)2002ETA SA Manufacture Horlogère…1 exec · grade ?ETA 2893-2 — open caliber pageETA 2893-2—ETA SA Manufacture Horlogère…1 exec · grade ?ETA 2893-3 (2892A2) — open caliber pageETA 2893-3 (2892A2)2002ETA SA Manufacture Horlogère…1 exec · grade ?ETA 2894-2 — open caliber pageETA 2894-21996ETA SA Manufactu…composite · 1 exec · grade ?ETA 2895-2 (2892A2) — open caliber pageETA 2895-2 (2892A2)1999ETA SA Manufacture Horlogère…1 exec · grade ?ETA 2896 (2892A2) — open caliber pageETA 2896 (2892A2)2003ETA SA Manufacture Horlogère…1 exec · grade ?ETA 2897 — open caliber pageETA 2897—ETA SA Manufacture Horlogère…1 exec · grade ?ETA A31.L11 — open caliber pageETA A31.L11—ETA SA Manufacture Horlogère…1 exec · grade ?Louis Erard 2001 (ETA 2892A2) — open caliber pageLouis Erard 2001 (ETA 2892A…2001maker not sourced1 exec · grade ?Omega 1118 (ETA 2891A9) — open caliber pageOmega 1118 (ETA 2891A…1991maker not sourced1 exec · grade ?Omega 1120 — open caliber pageOmega 1120—maker not sourc…1 exec · grade ?Omega 1143 — open caliber pageOmega 1143—maker not sourcedcomposite · 1 exec · grade ?Omega 2500 — the caliber this page is aboutOmega 25001999Omega1 exec · grade ?Omega 3220 — open caliber pageOmega 32202000maker not sourcedcomposite · 1 exec · grade ?Sea-Gull ST18 — open caliber pageSea-Gull ST18—Tianjin Sea-Gull Watch Group1 exec · grade ?Sellita SW300-1 — open caliber pageSellita SW300-12008Sellita Watch Co S.A.7 execSellita SW330-2 — open caliber pageSellita SW330-22020Sellita Watch Co S.A.2 exec
accepteddisputed
Sense of “family”Heritage · 20Everything (debug) · 25Parts cluster (Jules Borel sense) · 1Manufacturer-internal (Ranfft sense) · 1Based-on star (WatchBase sense) · 17Open the full family view →

movement

Omega 2500

George DanielsOmegaintroduced 1999design:omega-2500compare specs · 5
bounding evidence — no range is drawn on the era axis
not after 2007
Omega 8500 · introduced 2007 (sourced)a commercial replacement launches after what it replaces · → successor of · rule IR-10 · depth 1 · acceptedthe anchor's own source

Identity

A caliber is three separate things and this reference keeps them apart: the construction, the names it is sold under, and the article a brand actually bought. A watch model points at an execution — never at a bare construction — which is why “same caliber” is almost never a complete answer.

IDesign — the construction
Omega 2500
movementdesigner: George Danielsproducer: Omega
IIDesignations — 0 names

No designation is recorded for this design yet.

IIIExecutions — 1 article

No source in this corpus states which grade any Omega 2500 was bought at. That unknown is stored as a real row rather than left blank, so it can be counted, filtered and excluded from any comparison that would otherwise assume parity.

unknownsynthetic
evidence: unknown

no source states which grade this article was bought at — this row exists so 'unknown' stays countable instead of becoming an assumption

exec:omega-2500/unknown

Specifications

PropertyValueScopeStatusSources
Escapement brand name
esc.brand_name
Co-Axial—accepted
Escapement family
esc.family
co_axial—accepted
Frequency
osc.frequency_vph
28800 vphthe original 2500 as introduced; the source states the frequency was changed later in the calibre's lifeaccepted
Introduced
prod.intro_year
1999—accepted

Lineage

The same relationships as the tree at the top of this page, with their sources. An absence in a column means no source stated one.

Ancestors · 2

Where this construction came from. Read up the arrows.

Descendants · 0

What came from it — revisions, variants, clones, licensed copies.

None recorded. An absence here means no source stated one, not that none exists.

Related · 2

Stored in a different table from descent. A successor is not a child.

  • Roger W. Smith Series 2
    different from

    Both movements carry a Daniels co-axial escapement and they are not the same escapement: Smith's site says Omega used Daniels's slim-line version and only later moved to the original two-wheel-with-pinion form that the Series 2 was designed around.

  • Omega 8500
    successor of

    succeeds the 2500 in the lineup; the source explicitly denies derivation

Sources

  1. 1
    omegawatches.com
    https://www.omegawatches.com/en-us/chronicle/1999-a-revolutionary-new-escapement
    manufacturertier 1retrieved 2026-08-243 facts on this page
  2. 2
    Monochrome Watches
    https://monochrome-watches.com/omega-co-axial-escapement-technical-perspective/
    presstier 2retrieved 2026-08-243 facts on this page
  3. 3
    Watch-Wiki
    https://www.watch-wiki.net/index.php?title=Omega_2500
    wikitier 3retrieved 2026-08-244 facts on this pagecited, never crawled
  4. 4
    rwsmithwatches.com
    https://rwsmithwatches.com/evolution
    manufacturertier 1retrieved 2026-08-241 fact on this page
  5. 5
    teddybaldassarre.com
    https://teddybaldassarre.com/blogs/watches/co-axial-movement
    presstier 3retrieved 2026-08-241 fact on this page
  6. 6
    swatchgroup.com
    https://www.swatchgroup.com/en/services/archive/2010/omegas-co-axial-story
    presstier 3retrieved 2026-08-242 facts on this page
  7. 7
    Caliber Corner
    https://calibercorner.com/eta-caliber-2893-2/
    curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled
  8. 8
    Caliber Corner
    https://calibercorner.com/eta-caliber-2894-2/
    curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled
  9. 9
    Caliber Corner
    https://calibercorner.com/eta-caliber-2897/
    curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled
  10. 10
    Caliber Corner
    https://calibercorner.com/eta-caliber-a31-l11/
    curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled
  11. 11
    Watch-Wiki
    https://www.watch-wiki.net/doku.php?id=omega_3220
    wikitier 3retrieved 2026-08-242 facts on this pagecited, never crawled
  12. 12
    chinesewatchwiki.net
    https://chinesewatchwiki.net/Clone_movements
    wikitier 3retrieved 2026-08-241 fact on this page
  13. 13
    chinesewatchwiki.net
    https://chinesewatchwiki.net/Tianjin_Seagull
    wikitier 3retrieved 2026-08-241 fact on this page
  14. 14
    Monochrome Watches
    https://monochrome-watches.com/inside-sellita-the-giant-supplier-of-mechanical-movements-behind-the-scenes-watch-industry/
    presstier 2retrieved 2026-08-241 fact on this page
  15. 15
    Wikipedia
    https://en.wikipedia.org/wiki/Sellita
    wikitier 3retrieved 2026-08-241 fact on this page
  16. 16
    Caliber Corner
    https://calibercorner.com/sellita-caliber-sw330-2/
    curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled
  17. 17
    Internet Archive
    https://web.archive.org/web/20181107100500/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&ETA_2890A9
    archivetier 2retrieved 2018-11-071 fact on this page
  18. 18
    Internet Archive
    https://web.archive.org/web/20191119124213/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&ETA_2891A9
    archivetier 2retrieved 2019-11-191 fact on this page
  19. 19
    Internet Archive
    https://web.archive.org/web/20210923001509/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&ETA_2893_1
    archivetier 2retrieved 2021-09-231 fact on this page
  20. 20
    Internet Archive
    https://web.archive.org/web/20210423045019/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&ETA_2893_3
    archivetier 2retrieved 2021-04-231 fact on this page
  21. 21
    Internet Archive
    https://web.archive.org/web/20221126152756/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&ETA_2895_2
    archivetier 2retrieved 2022-11-261 fact on this page
  22. 22
    Internet Archive
    https://web.archive.org/web/20211025071621/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&ETA_2896&
    archivetier 2retrieved 2021-10-251 fact on this page
  23. 23
    Internet Archive
    https://web.archive.org/web/20171031001241/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&145&2uswk&Louis_Erard_2001
    archivetier 2retrieved 2017-10-311 fact on this page
  24. 24
    Internet Archive
    https://web.archive.org/web/20230901185814/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Omega_1118
    archivetier 2retrieved 2023-09-011 fact on this page