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:bifora-50/unknown
Family tree · none recorded
No lineage link to any other caliber is recorded for this design under the Heritage profile. That is a gap in the research, not a claim that none exists.
movement
Bifora 50
bounding evidence — no range is drawn on the era axis
not after 1955
a dated example movement, ca. 1950 (+5 yr, the source says “circa”)“ca.1950 : B, 50”
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
Bifora 50
movementproducer: Biforaarchive filing
IIDesignations — 0 names
No designation is recorded for this design yet.
IIIExecutions — 1 article
No source in this corpus states which grade any Bifora 50 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.
Specifications
| Property | Value | Scope | Status | Sources |
|---|---|---|---|---|
Jewels build.jewel_count | 15 | — | staged | |
Movement shape build.shape | rectangular | — | staged | |
Movement height geom.height_mm | 3.5 mm | — | staged | |
Frequency osc.frequency_vph | 18000 vph | — | staged | |
Power reserve (typical) power.reserve_typical_h | 37 h | — | staged | |
Discontinued prod.discontinued_year | 1935 | — | staged | |
Introduced prod.intro_year | 1932 | — | 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 · 0
Where this construction came from. Read up the arrows.
None recorded. An absence here means no source stated one, not that none exists.
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
- 1Internet Archivehttps://web.archive.org/web/20230905135647/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Bifora_50&archivetier 2retrieved 2023-09-0510 facts on this page