CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeFelsa 107 — Heritage family: 4 calibers, 3 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 ofBifora 8.75''' (Felsa 107) — open caliber pageBifora 8.75''' (Felsa 107)—maker not sourced1 exec · grade ?Felsa 107 — the caliber this page is aboutFelsa 107—Felsa SA1 exec · grade ?Silena 8.75''' (Felsa 107) — open caliber pageSilena 8.75''' (Felsa 107)—maker not sourced1 exec · grade ?ZentRa 50A (Felsa 107) — open caliber pageZentRa 50A (Felsa 107)—maker not sourc…1 exec · grade ?
accepteddisputed
Sense of “family”Heritage · 4Everything (debug) · 4Parts cluster (Jules Borel sense) · 1Manufacturer-internal (Ranfft sense) · 1Based-on star (WatchBase sense) · 4Open the full family view →

movement

Felsa 107

Felsa SAarchive filingyear not sourceddesign:felsa-107compare specs · 4

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
Felsa 107
movementproducer: Felsa SAarchive filing
IIDesignations — 0 names

No designation is recorded for this design yet.

IIIExecutions — 1 article

No source in this corpus states which grade any Felsa 107 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:felsa-107/unknown

Specifications

PropertyValueScopeStatusSources
Jewels
build.jewel_count
15—staged
Seconds display
disp.seconds_display
small—staged
Casing diameter
geom.casing_diameter_mm
19.75 mm—staged
Movement diameter
geom.diameter_mm
19.45 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
33 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/20211020233624/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Felsa_107
    archivetier 2retrieved 2021-10-209 facts on this page
  2. 2
    Internet Archive
    https://web.archive.org/web/20200918103311/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Bifora_8_75
    archivetier 2retrieved 2020-09-181 fact on this page
  3. 3
    Internet Archive
    https://web.archive.org/web/20220813123053/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Silena_8_75&
    archivetier 2retrieved 2022-08-131 fact on this page
  4. 4
    Internet Archive
    https://web.archive.org/web/20181108110937/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&ZentRa_50A
    archivetier 2retrieved 2018-11-081 fact on this page