CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeSilvana 1851 (Felsa 247) — Heritage family: 2 calibers, 1 sourced lineage link.Drag to explore.
100%drag to pan · hover a caliber to isolate its line · scroll the page normallyopen the full family view →
ébauche ofFelsa 247 — open caliber pageFelsa 247—Felsa SA1 exec · grade ?Silvana 1851 (Felsa 247) — the caliber this page is aboutSilvana 1851 (Felsa 247)—maker not sourced1 exec · grade ?
accepteddisputed
Sense of “family”Heritage · 2Everything (debug) · 2Parts cluster (Jules Borel sense) · 1Manufacturer-internal (Ranfft sense) · 1Based-on star (WatchBase sense) · 2Open the full family view →

movement

Silvana 1851 (Felsa 247)

maker not sourced⟨1930 or earlier⟩ range onlydesign:silvana-1851compare specs · 2
⟨1930 or earlier⟩ range only — no source gives an introduction yearread from sources · staged
not after 1930
a dated example movement, ca. 1925 (+5 yr, the source says “circa”)“ca. 1925: 1851 - Felsa (F in oval)”
not after 1930
a dated example movement, ca. 1925 (+5 yr, the source says “circa”)“ca. 1925: 1851 - Felsa (F in oval)”
not after 1930
a dated example movement, ca. 1925 (+5 yr, the source says “circa”)“ca. 1925: 1851 - Felsa (F in oval)”
not after 1930
a dated example movement, ca. 1925 (+5 yr, the source says “circa”)“ca. 1925: 1851 - Felsa (F in oval)”
not after 1930
a dated example movement, ca. 1925 (+5 yr, the source says “circa”)“ca. 1925: 1851 - Felsa (F in oval)”
not after 1930
a dated example movement, ca. 1925 (+5 yr, the source says “circa”)“ca. 1925: 1851 - Felsa (F in oval)”
not after 1930
a dated example movement, ca. 1925 (+5 yr, the source says “circa”)“ca. 1925: 1851 - Felsa (F in oval)”
not after 1930
a dated example movement, ca. 1925 (+5 yr, the source says “circa”)“ca. 1925: 1851 - Felsa (F in oval)”
not after 1930
a dated example movement, ca. 1925 (+5 yr, the source says “circa”)“ca. 1925: 1851 - Felsa (F in oval)”
not after 1930
a dated example movement, ca. 1925 (+5 yr, the source says “circa”)“ca. 1925: 1851 - Felsa (F in oval)”
not after 1930
a dated example movement, ca. 1925 (+5 yr, the source says “circa”)“ca. 1925: 1851 - Felsa (F in oval)”
not after 1930
a dated example movement, ca. 1925 (+5 yr, the source says “circa”)“ca. 1925: 1851 - Felsa (F in oval)”

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
Silvana 1851 (Felsa 247)
movement
IIDesignations — 0 names

No designation is recorded for this design yet.

IIIExecutions — 1 article

No source in this corpus states which grade any Silvana 1851 (Felsa 247) 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:silvana-1851/unknown

Specifications

PropertyValueScopeStatusSources
Jewels
build.jewel_count
15—staged
Seconds display
disp.seconds_display
small—staged
Casing diameter
geom.casing_diameter_mm
41.8 mm—staged
Movement diameter
geom.diameter_mm
41 mm—staged
Movement height
geom.height_mm
4.75 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 · 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/20230901232902/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Silvana_1851
    archivetier 2retrieved 2023-09-0110 facts on this page
  2. 2
    Internet Archive
    https://web.archive.org/web/20181107123809/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Felsa_315
    archivetier 2retrieved 2018-11-071 fact on this page
  3. 3
    Internet Archive
    https://web.archive.org/web/20191113125618/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Felsa_183
    archivetier 2retrieved 2019-11-131 fact on this page
  4. 4
    Internet Archive
    https://web.archive.org/web/20181107123326/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Felsa_249
    archivetier 2retrieved 2018-11-071 fact on this page
  5. 5
    Internet Archive
    https://web.archive.org/web/20181107123315/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Felsa_248
    archivetier 2retrieved 2018-11-071 fact on this page
  6. 6
    Internet Archive
    https://web.archive.org/web/20181107122855/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Felsa_181
    archivetier 2retrieved 2018-11-071 fact on this page
  7. 7
    Internet Archive
    https://web.archive.org/web/20181107123605/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Felsa_289
    archivetier 2retrieved 2018-11-071 fact on this page
  8. 8
    Internet Archive
    https://web.archive.org/web/20200927134547/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Felsa_182
    archivetier 2retrieved 2020-09-271 fact on this page
  9. 9
    Internet Archive
    https://web.archive.org/web/20181107122844/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Felsa_180
    archivetier 2retrieved 2018-11-071 fact on this page
  10. 10
    Internet Archive
    https://web.archive.org/web/20181107123338/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Felsa_254
    archivetier 2retrieved 2018-11-071 fact on this page
  11. 11
    Internet Archive
    https://web.archive.org/web/20181107123508/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Felsa_283
    archivetier 2retrieved 2018-11-071 fact on this page
  12. 12
    Internet Archive
    https://web.archive.org/web/20181107125532/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Felsa_449
    archivetier 2retrieved 2018-11-071 fact on this page