CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeGruen 487 (Universal 240) — Heritage family: 5 calibers, 4 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 ofAlpina 485 (Universal 240) — open caliber pageAlpina 485 (Universal 240)—maker not sourced1 exec · grade ?Gruen 485 (Universal 240) — open caliber pageGruen 485 (Universal 240)—maker not sourced1 exec · grade ?Gruen 487 (Universal 240) — the caliber this page is aboutGruen 487 (Universal 240)—maker not sourced1 exec · grade ?Marc Favre 485 (Universal 240) — open caliber pageMarc Favre 485 (Universal 240)—maker not sourced1 exec · grade ?Universal 240 — open caliber pageUniversal 240—maker not sourc…1 exec · grade ?
accepteddisputed
Sense of “family”Heritage · 5Everything (debug) · 5Parts cluster (Jules Borel sense) · 1Manufacturer-internal (Ranfft sense) · 1Based-on star (WatchBase sense) · 5Open the full family view →

movement

Gruen 487 (Universal 240)

maker not sourcedyear not sourceddesign:gruen-487compare specs · 2

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
Gruen 487 (Universal 240)
movement
IIDesignations — 0 names

No designation is recorded for this design yet.

IIIExecutions — 1 article

No source in this corpus states which grade any Gruen 487 (Universal 240) 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:gruen-487/unknown

Specifications

PropertyValueScopeStatusSources
Jewels
build.jewel_count
7—staged
Movement shape
build.shape
rectangular—staged
Movement height
geom.height_mm
3.7 mm—staged
Frequency
osc.frequency_vph
18000 vph—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 · 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/20230831001938/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?03&ranfft&0&2uswk&Gruen_487
    archivetier 2retrieved 2023-08-315 facts on this page
  2. 2
    Internet Archive
    https://web.archive.org/web/20230904004047/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Alpina_485&
    archivetier 2retrieved 2023-09-041 fact on this page
  3. 3
    Internet Archive
    https://web.archive.org/web/20230831001920/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?03&ranfft&0&2uswk&Gruen_485
    archivetier 2retrieved 2023-08-311 fact on this page
  4. 4
    Internet Archive
    https://web.archive.org/web/20171031001257/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&145&2uswk&Marc_Favre_485
    archivetier 2retrieved 2017-10-311 fact on this page