CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeETA 2391 — Heritage family: 7 calibers, 6 sourced lineage links.Drag to explore.
100%overlaydrag to pan · hover a caliber to isolate its line · scroll the page normallyopen the full family view →
ébauche ofébauche ofébauche ofébauche ofébauche ofébauche ofCortebert 266 (ETA 2391) — open caliber pageCortebert 266 (ETA 2391)—maker not sourced1 exec · grade ?Doxa 103 (ETA 2391) — open caliber pageDoxa 103 (ETA 2391)—maker not sourc…1 exec · grade ?Dugena 3313 (ETA 2391) — open caliber pageDugena 3313 (ETA 2391)—maker not sourc…1 exec · grade ?ETA 2391 — the caliber this page is aboutETA 2391—ETA SA Manufacture Horlogère…1 exec · grade ?Hamilton 61 (ETA 2391) — open caliber pageHamilton 61 (ETA 2391)—maker not sourc…1 exec · grade ?Hamilton 75S (ETA 2391) — open caliber pageHamilton 75S (ETA 2391)—maker not sourc…1 exec · grade ?Movado 290 (ETA 2391) — open caliber pageMovado 290 (ETA 239…1960maker not sourced1 exec · grade ?
accepteddisputed
Sense of “family”Heritage · 7Everything (debug) · 7Parts cluster (Jules Borel sense) · 1Manufacturer-internal (Ranfft sense) · 1Based-on star (WatchBase sense) · 7Open the full family view →

movement

ETA 2391

ETA SA Manufacture Horlogère Suissearchive filingyear not sourceddesign:eta-2391compare specs · 7
bounding evidence — no range is drawn on the era axis
not after 1960
a dated example movement, ca. 1955 (+5 yr, the source says “circa”)“3) ca. 1955: Swiss, Suter SU 2391, 17 Jewels; Incabloc”
not after 1965
a dated example movement, ca. 1960 (+5 yr, the source says “circa”)“1-2) ca. 1960: Silvana, Swiss Made, 17 Jewels - DH, Patented; Incabloc”
not after 1970
a dated example movement, ca. 1965 (+5 yr, the source says “circa”)“4-5) ca. 1965: DH, Swiss Made, 17 Jewels - Patented; Incabloc”

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 2391
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 2391 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:eta-2391/unknown

Specifications

PropertyValueScopeStatusSources
Jewels
build.jewel_count
17Ranfft data sheet, the 17-jewel member of its 17/21 rangestaged
Jewels
build.jewel_count
21Ranfft data sheet, the 21-jewel member of its 17/21 rangestaged
Seconds display
disp.seconds_display
central—staged
Casing diameter
geom.casing_diameter_mm
26 mm—staged
Movement diameter
geom.diameter_mm
25.6 mm—staged
Movement height
geom.height_mm
3.6 mm—staged
Frequency
osc.frequency_vph
18000 vph—staged
Shock protection
osc.shock_protection
incablocexample movement, 1960staged
Shock protection
osc.shock_protection
incablocexample movement, 1955staged
Shock protection
osc.shock_protection
incablocexample movement, 1965staged
Power reserve (typical)
power.reserve_typical_h
47 h—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 · 0

Where this construction came from. Read up the arrows.

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/20221127194115/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&ETA_2391
    archivetier 2retrieved 2022-11-2716 facts on this page
  2. 2
    Internet Archive
    https://web.archive.org/web/20181106123438/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Cortebert_266
    archivetier 2retrieved 2018-11-061 fact on this page
  3. 3
    Internet Archive
    https://web.archive.org/web/20181106131614/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Doxa_103
    archivetier 2retrieved 2018-11-061 fact on this page
  4. 4
    Internet Archive
    https://web.archive.org/web/20200928174129/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&b&2uswk&Dugena_3313
    archivetier 2retrieved 2020-09-281 fact on this page
  5. 5
    Internet Archive
    https://web.archive.org/web/20181107162646/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Hamilton_61
    archivetier 2retrieved 2018-11-071 fact on this page
  6. 6
    Internet Archive
    https://web.archive.org/web/20181107163225/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Hamilton_75S
    archivetier 2retrieved 2018-11-071 fact on this page
  7. 7
    Internet Archive
    https://web.archive.org/web/20171031003941/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&151&2uswk&Movado_290
    archivetier 2retrieved 2017-10-311 fact on this page