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-1257/unknown
Family tree · none recorded
No lineage link to any other caliber is recorded for this design under the Heritage profile. That is a gap in the research, not a claim that none exists.
movement
ETA 1257
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”)“1-2) ca. 1955: 4,G, V - DGA; Incabloc”
not after 1960
a dated example movement, ca. 1955 (+5 yr, the source says “circa”)“ca. 1955: 4,G, V - DGA; 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 1257
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 1257 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 | Ranfft data sheet, the 17-jewel member of its 17/21/25 range | staged | |
Jewels build.jewel_count | 21 | Ranfft data sheet, the 21-jewel member of its 17/21/25 range | staged | |
Jewels build.jewel_count | 25 | Ranfft data sheet, the 25-jewel member of its 17/21/25 range | staged | |
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 | 5.9 mm | — | staged | |
Frequency osc.frequency_vph | 18000 vph | — | staged | |
Shock protection osc.shock_protection | incabloc | example movement, 1955 | staged | |
Power reserve (typical) power.reserve_typical_h | 40 h | — | staged | |
Discontinued prod.discontinued_year | 1961 | 1256...1259 | staged | |
Introduced prod.intro_year | 1954 | 1256...1259 | staged | |
Production volume prod.volume_count | 11760102 | 1256...1259 | staged | |
Winding mode wind.mode | automatic | — | 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.
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.
Curated family labels
ETA family/generations block
authority: ranfft50 members
Sources
- 1Internet Archivehttps://web.archive.org/web/20181106155649/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&ETA_1257archivetier 2retrieved 2018-11-0616 facts on this page
- 2Internet Archivehttps://web.archive.org/web/20190826065400/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&ETA_1081archivetier 2retrieved 2019-08-261 fact on this page
- 3Internet Archivehttps://web.archive.org/web/20191121125757/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&ETA_1084archivetier 2retrieved 2019-11-211 fact on this page
- 4Internet Archivehttps://web.archive.org/web/20191121153441/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&ETA_1082archivetier 2retrieved 2019-11-211 fact on this page
- 5Internet Archivehttps://web.archive.org/web/20191122195052/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&ETA_1083archivetier 2retrieved 2019-11-221 fact on this page
- 6Internet Archivehttps://web.archive.org/web/20171030194648/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&74&2uswk&ETA_1259archivetier 2retrieved 2017-10-301 fact on this page