CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeBulova 10BU (AS 1200) — 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 ofAS 1200 — open caliber pageAS 1200—maker not sourc…1 exec · grade ?Bulova 10BC (AS 1200) — open caliber pageBulova 10BC (AS 120…1944maker not sourced1 exec · grade ?Bulova 10BCC (AS 1200) — open caliber pageBulova 10BCC (AS 120…1946maker not sourced1 exec · grade ?Bulova 10BS (AS 1200) — open caliber pageBulova 10BS (AS 120…1943maker not sourced1 exec · grade ?Bulova 10BT (AS 1200) — open caliber pageBulova 10BT (AS 120…1950maker not sourced1 exec · grade ?Bulova 10BTC (AS 1200) — open caliber pageBulova 10BTC (AS 120…1951maker not sourced1 exec · grade ?Bulova 10BU (AS 1200) — the caliber this page is aboutBulova 10BU (AS 120…1951maker not sourced1 exec · grade ?Bulova 10BUC (AS 1200) — open caliber pageBulova 10BUC (AS 120…1951maker not sourced1 exec · grade ?Bulova 10ZCC (AS 1200) — open caliber pageBulova 10ZCC (AS 1200)—maker not sourc…1 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

Bulova 10BU (AS 1200)

maker not sourcedintroduced 1951design:bulova-10bucompare specs · 2

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
Bulova 10BU (AS 1200)
movement
IIDesignations — 0 names

No designation is recorded for this design yet.

IIIExecutions — 1 article

No source in this corpus states which grade any Bulova 10BU (AS 1200) 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:bulova-10bu/unknown

Specifications

PropertyValueScopeStatusSources
Jewels
build.jewel_count
17—staged
Seconds display
disp.seconds_display
small—staged
Casing diameter
geom.casing_diameter_mm
23.7 mm—staged
Movement diameter
geom.diameter_mm
23.3 mm—staged
Movement height
geom.height_mm
3.5 mm—staged
Frequency
osc.frequency_vph
18000 vph—staged
Shock protection
osc.shock_protection
kifexample movement, 1951staged
Power reserve (typical)
power.reserve_typical_h
45 h—staged
Discontinued
prod.discontinued_year
1956—staged
Introduced
prod.intro_year
1951—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/20191215182538/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Bulova_10BU
    archivetier 2retrieved 2019-12-1512 facts on this page
  2. 2
    Internet Archive
    https://web.archive.org/web/20230905233650/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Bulova_10BC&
    archivetier 2retrieved 2023-09-051 fact on this page
  3. 3
    Internet Archive
    https://web.archive.org/web/20230905233806/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Bulova_10BCC&
    archivetier 2retrieved 2023-09-051 fact on this page
  4. 4
    Internet Archive
    https://web.archive.org/web/20181106113747/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Bulova_10BS
    archivetier 2retrieved 2018-11-061 fact on this page
  5. 5
    Internet Archive
    https://web.archive.org/web/20181106113753/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Bulova_10BT
    archivetier 2retrieved 2018-11-061 fact on this page
  6. 6
    Internet Archive
    https://web.archive.org/web/20191021223310/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Bulova_10BTC
    archivetier 2retrieved 2019-10-211 fact on this page
  7. 7
    Internet Archive
    https://web.archive.org/web/20230905235932/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Bulova_10BUC&
    archivetier 2retrieved 2023-09-051 fact on this page
  8. 8
    Internet Archive
    https://web.archive.org/web/20191021022351/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Bulova_10ZCC
    archivetier 2retrieved 2019-10-211 fact on this page