CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeBulova 7AA (ETA 735) — Heritage family: 8 calibers, 7 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 ofBulova 7AA (ETA 735) — the caliber this page is aboutBulova 7AA (ETA 735)1947maker not sourc…1 exec · grade ?Bulova 7AH (ETA 735) — open caliber pageBulova 7AH (ETA 735)1928maker not sourc…1 exec · grade ?Bulova 7AK (ETA 735) — open caliber pageBulova 7AK (ETA 735)1936maker not sourc…1 exec · grade ?Bulova 7AN (ETA 735) — open caliber pageBulova 7AN (ETA 735)—maker not sourc…1 exec · grade ?Bulova 7AP (ETA 735) — open caliber pageBulova 7AP (ETA 735)1936maker not sourc…1 exec · grade ?Dugena 839 (ETA 735) — open caliber pageDugena 839 (ETA 735)—maker not sourc…1 exec · grade ?ETA 735 — open caliber pageETA 735—ETA SA Manufacture Horlogère…1 exec · grade ?Silvana 7775 (ETA 735) — open caliber pageSilvana 7775 (ETA 735)—maker not sourc…1 exec · grade ?
accepteddisputed
Sense of “family”Heritage · 8Everything (debug) · 8Parts cluster (Jules Borel sense) · 1Manufacturer-internal (Ranfft sense) · 1Based-on star (WatchBase sense) · 8Open the full family view →

movement

Bulova 7AA (ETA 735)

maker not sourcedintroduced 1947design:bulova-7aacompare specs · 2
bounding evidence — no range is drawn on the era axis
not after 1952
a dated example movement, 1952“1952: L2, Bulova Watch Co, U.S.A, 7AA, 21 Jewels”

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 7AA (ETA 735)
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 7AA (ETA 735) 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-7aa/unknown

Specifications

PropertyValueScopeStatusSources
Jewels
build.jewel_count
21—staged
Movement shape
build.shape
rectangular—staged
Seconds display
disp.seconds_display
small—staged
Movement height
geom.height_mm
3.55 mm—staged
Frequency
osc.frequency_vph
18000 vph—staged
Power reserve (typical)
power.reserve_typical_h
47 h—staged
Discontinued
prod.discontinued_year
1953—staged
Introduced
prod.intro_year
1947—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/20230906043506/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Bulova_7AA&
    archivetier 2retrieved 2023-09-0611 facts on this page
  2. 2
    Internet Archive
    https://web.archive.org/web/20181106115451/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Bulova_7AH
    archivetier 2retrieved 2018-11-061 fact on this page
  3. 3
    Internet Archive
    https://web.archive.org/web/20181106115457/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Bulova_7AK
    archivetier 2retrieved 2018-11-061 fact on this page
  4. 4
    Internet Archive
    https://web.archive.org/web/20181106115503/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Bulova_7AN
    archivetier 2retrieved 2018-11-061 fact on this page
  5. 5
    Internet Archive
    https://web.archive.org/web/20181106115509/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Bulova_7AP
    archivetier 2retrieved 2018-11-061 fact on this page
  6. 6
    Internet Archive
    https://web.archive.org/web/20230907064335/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Dugena_839&
    archivetier 2retrieved 2023-09-071 fact on this page
  7. 7
    Internet Archive
    https://web.archive.org/web/20230901232917/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Silvana_7775
    archivetier 2retrieved 2023-09-011 fact on this page