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:certina-15-21/unknown
accepteddisputed
movement
Certina 15-21
bounding evidence — no range is drawn on the era axis
not after 1970
a dated example movement, ca. 1965 (+5 yr, the source says “circa”)“ca. 1965: Certina, 15-21, 32 Jewels; 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
Certina 15-21
movementproducer: Certinaarchive filing
IIDesignations — 0 names
No designation is recorded for this design yet.
IIIExecutions — 1 article
No source in this corpus states which grade any Certina 15-21 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 | 32 | — | staged | |
Casing diameter geom.casing_diameter_mm | 15.6 mm | — | staged | |
Movement diameter geom.diameter_mm | 15.3 mm | — | staged | |
Movement height geom.height_mm | 4.7 mm | — | staged | |
Frequency osc.frequency_vph | 21600 vph | — | staged | |
Shock protection osc.shock_protection | incabloc | example movement, 1965 | staged | |
Power reserve (typical) power.reserve_typical_h | 39 h | — | staged | |
Introduced prod.intro_year | 1964 | — | staged | |
Winding mode wind.mode | automatic | — | staged |
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.
- Longines 472 (Certina 15-21)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.
Curated family labels
Certina family/generations block
authority: ranfft4 members
Sources
- 1Internet Archivehttps://web.archive.org/web/20230906064807/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Certina_15_21&archivetier 2retrieved 2023-09-0612 facts on this page
- 2Internet Archivehttps://web.archive.org/web/20181106121027/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Certina_17_211archivetier 2retrieved 2018-11-061 fact on this page
- 3Internet Archivehttps://web.archive.org/web/20220129132439/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Certina_17_221archivetier 2retrieved 2022-01-291 fact on this page
- 4Internet Archivehttps://web.archive.org/web/20230906064551/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Certina_15_20&archivetier 2retrieved 2023-09-061 fact on this page
- 5Internet Archivehttps://web.archive.org/web/20230901163609/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Longines_472archivetier 2retrieved 2023-09-011 fact on this page