CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeAlpina 807 (Venus 55) — 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 806 (Venus 55) — open caliber pageAlpina 806 (Venus 55)—maker not sourc…1 exec · grade ?Alpina 807 (Venus 55) — the caliber this page is aboutAlpina 807 (Venus 55)—maker not sourc…1 exec · grade ?Alpina 808 (Venus 55) — open caliber pageAlpina 808 (Venus 55)—maker not sourc…1 exec · grade ?Venus 55 — open caliber pageVenus 55—Fabrique d'Ebauches Venus SA1 exec · grade ?ZentRa 32A (Venus 55) — open caliber pageZentRa 32A (Venus 55)—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

Alpina 807 (Venus 55)

maker not sourced⟨1935 or earlier⟩ range onlydesign:alpina-807compare specs · 2
⟨1935 or earlier⟩ range only — no source gives an introduction yearread from sources · staged
not after 1935
a dated example movement, ca. 1930 (+5 yr, the source says “circa”)“1-2) ca. 1930: Alpina, 807”
not after 1935
a dated example movement, ca. 1930 (+5 yr, the source says “circa”)“1-2) ca. 1930: Alpina, 807”
not after 1935
a dated example movement, ca. 1930 (+5 yr, the source says “circa”)“ca. 1930: Alpina, 807”
not after 1935
a dated example movement, ca. 1930 (+5 yr, the source says “circa”)“1-2) ca. 1930: Alpina, 807”

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
Alpina 807 (Venus 55)
movement
IIDesignations — 0 names

No designation is recorded for this design yet.

IIIExecutions — 1 article

No source in this corpus states which grade any Alpina 807 (Venus 55) 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:alpina-807/unknown

Specifications

PropertyValueScopeStatusSources
Jewels
build.jewel_count
15—staged
Movement shape
build.shape
rectangular—staged
Movement height
geom.height_mm
3.4 mm—staged
Frequency
osc.frequency_vph
18000 vph—staged
Power reserve (typical)
power.reserve_typical_h
40 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/20230904033843/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Alpina_807&
    archivetier 2retrieved 2023-09-048 facts on this page
  2. 2
    Internet Archive
    https://web.archive.org/web/20181108101119/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Venus_55
    archivetier 2retrieved 2018-11-081 fact on this page
  3. 3
    Internet Archive
    https://web.archive.org/web/20181108101130/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Venus_58
    archivetier 2retrieved 2018-11-081 fact on this page
  4. 4
    Internet Archive
    https://web.archive.org/web/20181108101141/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Venus_59
    archivetier 2retrieved 2018-11-081 fact on this page
  5. 5
    Internet Archive
    https://web.archive.org/web/20230904033612/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Alpina_806&
    archivetier 2retrieved 2023-09-041 fact on this page
  6. 6
    Internet Archive
    https://web.archive.org/web/20181106094218/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Alpina_808
    archivetier 2retrieved 2018-11-061 fact on this page
  7. 7
    Internet Archive
    https://web.archive.org/web/20181108110901/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&ZentRa_32A
    archivetier 2retrieved 2018-11-081 fact on this page