CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeFHF Robert 8.75''' — Heritage family: 9 calibers, 8 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 ofébauche ofébauche ofébauche ofébauche ofFHF Robert 8.75''' — the caliber this page is aboutFHF Robert 8.75'''—maker not sourc…1 exec · grade ?Gruen 100 (FHF Robert 8.75''') — open caliber pageGruen 100 (FHF Robert 8.75''…1915maker not sourced1 exec · grade ?Gruen 101 (FHF Robert 8.75''') — open caliber pageGruen 101 (FHF Robert 8.75''…1915maker not sourced1 exec · grade ?Gruen 620 (FHF Robert 8.75''') — open caliber pageGruen 620 (FHF Robert 8.75''…1917maker not sourced1 exec · grade ?Gruen 621 (FHF Robert 8.75''') — open caliber pageGruen 621 (FHF Robert 8.75''…1917maker not sourced1 exec · grade ?Gruen 622 (FHF Robert 8.75''') — open caliber pageGruen 622 (FHF Robert 8.75''…1910maker not sourced1 exec · grade ?Gruen 623 (FHF Robert 8.75''') — open caliber pageGruen 623 (FHF Robert 8.75''…1910maker not sourced1 exec · grade ?Gruen 626 (FHF Robert 8.75''') — open caliber pageGruen 626 (FHF Robert 8.75''…1918maker not sourced1 exec · grade ?Gruen 627 (FHF Robert 8.75''') — open caliber pageGruen 627 (FHF Robert 8.75''…1918maker not sourced1 exec · grade ?
accepteddisputed
Sense of “family”Heritage · 9Everything (debug) · 9Parts cluster (Jules Borel sense) · 1Manufacturer-internal (Ranfft sense) · 1Based-on star (WatchBase sense) · 9Open the full family view →

movement

FHF Robert 8.75'''

maker not sourced⟨1925 or earlier⟩ range onlydesign:fhf-robert-8-75compare specs · 8
⟨1925 or earlier⟩ range only — no source gives an introduction yearread from sources · staged
not after 1925
a dated example movement, ca. 1920 (+5 yr, the source says “circa”)“1-2) ca. 1920: - 39, +51482”
not after 1930
a dated example movement, ca. 1925 (+5 yr, the source says “circa”)“2-3) ca. 1925: Swiss Made - +51482”

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
FHF Robert 8.75'''
movement
IIDesignations — 0 names

No designation is recorded for this design yet.

IIIExecutions — 1 article

No source in this corpus states which grade any FHF Robert 8.75''' 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:fhf-robert-8-75/unknown

Specifications

PropertyValueScopeStatusSources
Jewels
build.jewel_count
15—staged
Seconds display
disp.seconds_display
small—staged
Casing diameter
geom.casing_diameter_mm
19.8 mm—staged
Movement diameter
geom.diameter_mm
19.4 mm—staged
Movement height
geom.height_mm
3.3 mm—staged
Frequency
osc.frequency_vph
18000 vph—staged
Power reserve (typical)
power.reserve_typical_h
34 h—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 · 0

Where this construction came from. Read up the arrows.

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/20220118020021/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&FHF_Robert_8_75
    archivetier 2retrieved 2022-01-1810 facts on this page
  2. 2
    Internet Archive
    https://web.archive.org/web/20181107154214/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Gruen_100
    archivetier 2retrieved 2018-11-071 fact on this page
  3. 3
    Internet Archive
    https://web.archive.org/web/20201001154209/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Gruen_101
    archivetier 2retrieved 2020-10-011 fact on this page
  4. 4
    Internet Archive
    https://web.archive.org/web/20181107160446/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Gruen_620
    archivetier 2retrieved 2018-11-071 fact on this page
  5. 5
    Internet Archive
    https://web.archive.org/web/20181107160458/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Gruen_621
    archivetier 2retrieved 2018-11-071 fact on this page
  6. 6
    Internet Archive
    https://web.archive.org/web/20181107160509/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Gruen_622
    archivetier 2retrieved 2018-11-071 fact on this page
  7. 7
    Internet Archive
    https://web.archive.org/web/20181107160520/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Gruen_623
    archivetier 2retrieved 2018-11-071 fact on this page
  8. 8
    Internet Archive
    https://web.archive.org/web/20181107160543/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Gruen_626
    archivetier 2retrieved 2018-11-071 fact on this page
  9. 9
    Internet Archive
    https://web.archive.org/web/20181107160554/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Gruen_627
    archivetier 2retrieved 2018-11-071 fact on this page