CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeGruen 879 (Rolex 170) — Heritage family: 3 calibers, 2 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 ofAlpina 879 (Rolex 170) — open caliber pageAlpina 879 (Rolex 170)—maker not sourc…1 exec · grade ?Gruen 879 (Rolex 170) — the caliber this page is aboutGruen 879 (Rolex 170)—maker not sourc…1 exec · grade ?Rolex 170 — open caliber pageRolex 170—Rolex SA1 exec · grade ?
accepteddisputed
Sense of “family”Heritage · 3Everything (debug) · 3Parts cluster (Jules Borel sense) · 1Manufacturer-internal (Ranfft sense) · 1Based-on star (WatchBase sense) · 3Open the full family view →

movement

Gruen 879 (Rolex 170)

maker not sourced⟨1940 or earlier⟩ range onlydesign:gruen-879compare specs · 2
⟨1940 or earlier⟩ range only — no source gives an introduction yearread from sources · staged
not after 1940
a dated example movement, ca. 1935 (+5 yr, the source says “circa”)“ca. 1935: 1930777, 897, Gruen Guild .A., 17 Jewels, Swiss - 9777, Patents”
not after 1940
a dated example movement, ca. 1935 (+5 yr, the source says “circa”)“ca. 1935: 1930777, 897, Gruen Guild .A., 17 Jewels, Swiss - 9777, Patents”
not after 1940
a dated example movement, ca. 1935 (+5 yr, the source says “circa”)“ca. 1935: 1930777, 897, Gruen Guild .A., 17 Jewels, Swiss - 9777, Patents”

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 879 (Rolex 170)
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 879 (Rolex 170) 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-879/unknown

Specifications

PropertyValueScopeStatusSources
Jewels
build.jewel_count
17—staged
Movement shape
build.shape
rectangular—staged
Movement height
geom.height_mm
3.2 mm—staged
Frequency
osc.frequency_vph
18000 vph—staged
Winding mode
wind.mode
manual—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/20181107161059/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Gruen_879
    archivetier 2retrieved 2018-11-077 facts on this page
  2. 2
    Internet Archive
    https://web.archive.org/web/20230904042131/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Alpina_879&
    archivetier 2retrieved 2023-09-042 facts on this page
  3. 3
    Internet Archive
    https://web.archive.org/web/20221214064820/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&2&2uswk&Rolex_170
    archivetier 2retrieved 2022-12-141 fact on this page