CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.

Family line

Certina 15-20

Everything (debug)2 calibers1 lineage edges0 related edgesdesign:certina-15-20compare specs · 2

This profile traverses clone_of · derived_from · design_imitation_of · ebauche_of · incorporates_module · licensed_copy_of · module_on · revision_of · tooling_transfer_of · variant_of and keeps disputed edges. Every edge in this view carries at least one reference.

Same caliber, other senses of “family”Heritage · 2 calibersParts cluster (Jules Borel sense) · 1 calibersManufacturer-internal (Ranfft sense) · 1 calibersBased-on star (WatchBase sense) · 2 calibers
100%overlaydrag to pan · ⌘/ctrl + scroll to zoom · hover a caliber to isolate its line
ébauche ofCertina 15-20 — open caliber pageCertina 15-201963Certi…1 exec · grade ?Longines 470 (Certina 15-20) — open caliber pageLongines 470 (Certina 15-20)—maker not sourced1 exec · grade ?
Edge types in this family
accepteddisputedcontested region

Generations run left to right, ancestors first, and the axis along the top is ordinal rather than linear: each band is one generation, labelled with the range of sourced introduction years it contains. A band reads “—” when no caliber in it has a year anyone published — the gap is the finding, not a rendering failure. Dotted arcs above and below the drawing are related edges — successor, drop-in, no-derivation — which are stored in a different table from lineage and can never form part of an ancestry path.

Every edge in this view

CaliberRelationshipToStatusDetailSources
Longines 470 (Certina 15-20)ébauche of
lineage
Certina 15-20staged—

Curated overlays

A curated family label is an attributed opinion about grouping, not a node in the graph. No edge can point at one, and membership never affects ancestry.

Sources

  1. 1
    Internet Archive
    https://web.archive.org/web/20230901163601/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Longines_470
    archivetier 2retrieved 2023-09-011 fact on this page
  2. 2
    Internet Archive
    https://web.archive.org/web/20181106121027/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Certina_17_211
    archivetier 2retrieved 2018-11-061 fact on this page
  3. 3
    Internet Archive
    https://web.archive.org/web/20220129132439/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Certina_17_221
    archivetier 2retrieved 2022-01-291 fact on this page
  4. 4
    Internet Archive
    https://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
  5. 5
    Internet Archive
    https://web.archive.org/web/20230906064807/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Certina_15_21&
    archivetier 2retrieved 2023-09-061 fact on this page