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:eta-2640/unknown
accepteddisputed
movement
ETA 2640
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
ETA 2640
movementproducer: ETA SA Manufacture Horlogère Suissearchive filing
IIDesignations — 0 names
No designation is recorded for this design yet.
IIIExecutions — 1 article
No source in this corpus states which grade any ETA 2640 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.
Specifications
| Property | Value | Scope | Status | Sources |
|---|---|---|---|---|
Jewels build.jewel_count | 17 | — | accepted | |
Seconds display disp.seconds_display | central | — | staged | |
Lift angle esc.lift_angle_deg | 53 deg | — | accepted | |
Casing diameter geom.casing_diameter_mm | 17.5 mm | — | staged | |
Movement diameter geom.diameter_mm | 17.5 mm | — | accepted | |
Movement diameter geom.diameter_mm | 17.2 mm | — | accepted | |
Movement height geom.height_mm | 3.5 mm | — | accepted | |
Swiss movement origin.swiss_movement | yes | — | accepted | |
Frequency osc.frequency_vph | 21600 vph | — | accepted | |
Shock protection osc.shock_protection | incabloc | example movement, 1975 | staged | |
Power reserve (typical) power.reserve_typical_h | 40 h | — | accepted | |
Power reserve (typical) power.reserve_typical_h | 48 h | — | accepted | |
Discontinued prod.discontinued_year | 1980 | ETA 2650+2651+2658: 7574956 | staged | |
Introduced prod.intro_year | 1971 | ETA 2650+2651+2658: 7574956 | staged | |
Winding mode wind.mode | manual | — | accepted |
Where a property carries more than one value, the values have different scopes — an official spec sheet and observed hardware, say. Different scopes are not a disagreement, so both are accepted and both are shown with the scope they apply to.
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 · 0
Where this construction came from. Read up the arrows.
None recorded. An absence here means no source stated one, not that none exists.
Descendants · 1
What came from it — revisions, variants, clones, licensed copies.
- Dugena 3340 (ETA 2640)ébauche of
Related · 0
Stored in a different table from descent. A successor is not a child.
None recorded. An absence here means no source stated one, not that none exists.
Sources
- 1Internet Archivehttps://web.archive.org/web/20181107094544/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&ETA_2640archivetier 2retrieved 2018-11-0712 facts on this page
- 2Caliber Cornerhttps://calibercorner.com/eta-caliber-2640curated dbtier 2retrieved 2026-09-088 facts on this pagecited, never crawled
- 3Internet Archivehttps://web.archive.org/web/20181106134523/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Dugena_3340archivetier 2retrieved 2018-11-061 fact on this page