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-3913/unknown
accepteddisputed
movement
Dugena 3913 (Unitas 6498)
bounding evidence — no range is drawn on the era axis
not after 1990
a dated example movement, ca. 1985 (+5 yr, the source says “circa”)“ca. 1985: MB, Swiss, 17 Jewels; Novodiac”
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 3913 (Unitas 6498)
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 3913 (Unitas 6498) 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 | Ranfft data sheet, the 15-jewel member of its 15/17 range | staged | |
Jewels build.jewel_count | 17 | Ranfft data sheet, the 17-jewel member of its 15/17 range | staged | |
Seconds display disp.seconds_display | small | — | staged | |
Casing diameter geom.casing_diameter_mm | 37.2 mm | — | staged | |
Movement diameter geom.diameter_mm | 36.6 mm | — | staged | |
Movement height geom.height_mm | 4.2 mm | — | staged | |
Frequency osc.frequency_vph | 18000 vph | — | staged | |
Shock protection osc.shock_protection | novodiac | example movement, 1985 | staged | |
Power reserve (typical) power.reserve_typical_h | 50 h | — | staged | |
Introduced prod.intro_year | 1950 | — | staged | |
Winding mode wind.mode | manual | — | staged |
Where a property carries more than one value, the values have different scopes — an official spec sheet and observed hardware, say. Different scopes are not a disagreement, so both are accepted and both are shown with the scope they apply to.
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 · 2
Where this construction came from. Read up the arrows.
- Unitas / ETA 6498ébauche of
- Unitas / ETA 6497ébauche ofvariant ofdepth 2
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/20181106134936/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Dugena_3913archivetier 2retrieved 2018-11-0613 facts on this page
- 2chinesewatchwiki.nethttps://chinesewatchwiki.net/Clone_movementswikitier 3retrieved 2026-08-242 facts on this page
- 3Caliber Cornerhttps://calibercorner.com/eta-unitas-caliber-6497-vs-6498/curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled
- 4Monochrome Watcheshttps://monochrome-watches.com/history-eta-unitas-6497-and-6498-hand-wound-lepine-savonette-movements-technical-guide/presstier 2retrieved 2026-08-241 fact on this page
- 5Internet Archivehttps://web.archive.org/web/20181106134924/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&a0&2uswk&Dugena_3911archivetier 2retrieved 2018-11-061 fact on this page
- 6Internet Archivehttps://web.archive.org/web/20171119001912/http://www.ranfft.de:80/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Omega_960archivetier 2retrieved 2017-11-191 fact on this page