CALIBER/browser
CORPUS EXPORT · 12269 calibers · 59387 family views · round round/2026-09-08Compiled from app/public/data/ · corpus 70c0140eba.
Family treeDugena 981 (Bifora 115) — Heritage family: 2 calibers, 1 sourced lineage link.Drag to explore.
100%overlaydrag to pan · hover a caliber to isolate its line · scroll the page normallyopen the full family view →
ébauche ofBifora 115 — open caliber pageBifora 115—Bifora1 exec · grade ?Dugena 981 (Bifora 115) — the caliber this page is aboutDugena 981 (Bifora 11…1967maker 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

Dugena 981 (Bifora 115)

maker not sourcedintroduced 1967design:dugena-981compare specs · 2
bounding evidence — no range is drawn on the era axis
not after 1975
a dated example movement, ca. 1970 (+5 yr, the source says “circa”)“ca. 1970: Bifora, Germany, 17 Jewels; Bifora-Bishock”

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
Dugena 981 (Bifora 115)
movement
IIDesignations — 0 names

No designation is recorded for this design yet.

IIIExecutions — 1 article

No source in this corpus states which grade any Dugena 981 (Bifora 115) 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:dugena-981/unknown

Specifications

PropertyValueScopeStatusSources
Jewels
build.jewel_count
17—staged
Seconds display
disp.seconds_display
central—staged
Movement diameter
geom.diameter_mm
25.6 mm—staged
Movement height
geom.height_mm
3.6 mm—staged
Frequency
osc.frequency_vph
18000 vph—staged
Shock protection
osc.shock_protection
otherexample movement, 1970staged
Power reserve (typical)
power.reserve_typical_h
45 h—staged
Introduced
prod.intro_year
1967—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.

Curated family labels

Dugena family/generations block
authority: ranfft4 members

Sources

  1. 1
    Internet Archive
    https://web.archive.org/web/20191023021530/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Dugena_981
    archivetier 2retrieved 2019-10-2312 facts on this page
  2. 2
    Internet Archive
    https://web.archive.org/web/20230906235629/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Dugena_1181&
    archivetier 2retrieved 2023-09-061 fact on this page
  3. 3
    Internet Archive
    https://web.archive.org/web/20230907004337/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Dugena_2004&
    archivetier 2retrieved 2023-09-071 fact on this page
  4. 4
    Internet Archive
    https://web.archive.org/web/20230907004437/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Dugena_2005&
    archivetier 2retrieved 2023-09-071 fact on this page