CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeEterna 12660B (ETA 2660) — Heritage family: 6 calibers, 5 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 →
ébauche ofébauche ofébauche ofébauche ofébauche ofDugena 3355 (ETA 2660) — open caliber pageDugena 3355 (ETA 2660)—maker not sourc…1 exec · grade ?ETA 2660 — open caliber pageETA 26601971ETA SA Manufacture Horlogère…1 exec · grade ?Eterna 12660 (ETA 2660) — open caliber pageEterna 12660 (ETA 266…1971maker not sourced1 exec · grade ?Eterna 12660B (ETA 2660) — the caliber this page is aboutEterna 12660B (ETA 266…1971maker not sourced1 exec · grade ?MST 489 (ETA 2660) — open caliber pageMST 489 (ETA 2660)1971maker not sourc…1 exec · grade ?Tissot 2351 (ETA 2660) — open caliber pageTissot 2351 (ETA 266…1972maker not sourced1 exec · grade ?
accepteddisputed
Sense of “family”Heritage · 6Everything (debug) · 6Parts cluster (Jules Borel sense) · 1Manufacturer-internal (Ranfft sense) · 1Based-on star (WatchBase sense) · 6Open the full family view →

movement

Eterna 12660B (ETA 2660)

maker not sourcedintroduced 1971design:eterna-12660bcompare specs · 2
bounding evidence — no range is drawn on the era axis
not after 1975
a dated example movement, ca. 1970 (+5 yr, the source says “circa”)“1-2) ca. 1970: Eterna, Swiss - Patented; Kif-Ultraflex”
not after 1975
a dated example movement, ca. 1970 (+5 yr, the source says “circa”)“1-2) ca. 1970: Eterna, Swiss - Patented; Kif-Ultraflex”
not after 1975
a dated example movement, ca. 1970 (+5 yr, the source says “circa”)“1-2) ca. 1970: Eterna, Swiss - Patented; Kif-Ultraflex”
not after 1975
a dated example movement, ca. 1970 (+5 yr, the source says “circa”)“1-2) ca. 1970: Eterna, Swiss - Patented; Kif-Ultraflex”
not after 1980
a dated example movement, ca. 1975 (+5 yr, the source says “circa”)“3-4) ca. 1975: Eterna, Swiss - Patented; Kif-Ultraflex”
not after 1980
a dated example movement, ca. 1975 (+5 yr, the source says “circa”)“3-4) ca. 1975: Eterna, Swiss - Patented; Kif-Ultraflex”
not after 1980
a dated example movement, ca. 1975 (+5 yr, the source says “circa”)“2) ca. 1975: Eterna, Swiss - Patented; Kif-Ultraflex”
not after 1980
a dated example movement, ca. 1975 (+5 yr, the source says “circa”)“3-4) ca. 1975: Eterna, Swiss - Patented; Kif-Ultraflex”
not after 1980
a dated example movement, ca. 1975 (+5 yr, the source says “circa”)“2) ca. 1975: Eterna, Swiss - Patented; Kif-Ultraflex”
not after 1980
a dated example movement, ca. 1975 (+5 yr, the source says “circa”)“3-4) ca. 1975: Eterna, Swiss - Patented; Kif-Ultraflex”
not after 1980
a dated example movement, ca. 1975 (+5 yr, the source says “circa”)“3) ca. 1975: Eterna, Swiss - Patented; Kif-Ultraflex”

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
Eterna 12660B (ETA 2660)
movement
IIDesignations — 0 names

No designation is recorded for this design yet.

IIIExecutions — 1 article

No source in this corpus states which grade any Eterna 12660B (ETA 2660) 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:eterna-12660b/unknown

Specifications

PropertyValueScopeStatusSources
Jewels
build.jewel_count
17—staged
Casing diameter
geom.casing_diameter_mm
17.5 mm—staged
Movement diameter
geom.diameter_mm
17.2 mm—staged
Movement height
geom.height_mm
3.5 mm—staged
Frequency
osc.frequency_vph
28800 vph—staged
Shock protection
osc.shock_protection
kifexample movement, 1970staged
Shock protection
osc.shock_protection
kifexample movement, 1975staged
Power reserve (typical)
power.reserve_typical_h
49 h—staged
Introduced
prod.intro_year
1971—staged
Winding mode
wind.mode
manual—staged

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 · 1

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 · 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

  1. 1
    Internet Archive
    https://web.archive.org/web/20181107104945/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Eterna_12660B
    archivetier 2retrieved 2018-11-0713 facts on this page
  2. 2
    Internet Archive
    https://web.archive.org/web/20181107105008/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Eterna_12668
    archivetier 2retrieved 2018-11-072 facts on this page
  3. 3
    Internet Archive
    https://web.archive.org/web/20181107104956/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Eterna_12661
    archivetier 2retrieved 2018-11-072 facts on this page
  4. 4
    Internet Archive
    https://web.archive.org/web/20181107104934/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Eterna_12660
    archivetier 2retrieved 2018-11-073 facts on this page
  5. 5
    Internet Archive
    https://web.archive.org/web/20181107094714/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&ETA_2668
    archivetier 2retrieved 2018-11-071 fact on this page
  6. 6
    Internet Archive
    https://web.archive.org/web/20181107094703/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&ETA_2661
    archivetier 2retrieved 2018-11-071 fact on this page
  7. 7
    Internet Archive
    https://web.archive.org/web/20210917041032/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&ETA_2660
    archivetier 2retrieved 2021-09-171 fact on this page
  8. 8
    Internet Archive
    https://web.archive.org/web/20181106134620/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Dugena_3355
    archivetier 2retrieved 2018-11-061 fact on this page
  9. 9
    Internet Archive
    https://web.archive.org/web/20171031005207/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&154&2uswk&MST_489
    archivetier 2retrieved 2017-10-311 fact on this page
  10. 10
    Internet Archive
    https://web.archive.org/web/20181108071910/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Tissot_2351
    archivetier 2retrieved 2018-11-081 fact on this page