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:seiko-6138a/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
Seiko 6138A
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
Seiko 6138A
movementproducer: Seiko Watch Corporationarchive filing
IIDesignations — 0 names
No designation is recorded for this design yet.
IIIExecutions — 1 article
No source in this corpus states which grade any Seiko 6138A 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 | 21 | — | accepted | |
Date correction disp.date_quickset | crown | — | staged | |
Date disp.has_date | yes | — | staged | |
Day disp.has_day | yes | — | staged | |
Casing diameter geom.casing_diameter_mm | 27.4 mm | — | staged | |
Movement diameter geom.diameter_mm | 27 mm | — | accepted | |
Movement height geom.height_mm | 7.9 mm | — | accepted | |
Movement height geom.height_mm | 8 mm | — | accepted | |
Frequency osc.frequency_vph | 21600 vph | — | accepted | |
Shock protection osc.shock_protection | diashock | example movement, 1974 | staged | |
Power reserve (typical) power.reserve_typical_h | 45 h | — | staged | |
Discontinued prod.discontinued_year | 1972 | — | staged | |
Introduced prod.intro_year | 1970 | — | staged | |
Winding mode wind.mode | automatic | — | accepted |
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 · 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.
Curated family labels
Seiko family/generations block
authority: ranfft12 members
Sources
- 1Internet Archivehttps://web.archive.org/web/20220818172251/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Seiko_6138A&archivetier 2retrieved 2022-08-1814 facts on this page
- 2Caliber Cornerhttps://calibercorner.com/seiko-caliber-6138acurated dbtier 2retrieved 2026-09-085 facts on this pagecited, never crawled
- 3Internet Archivehttps://web.archive.org/web/20230901231712/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Seiko_6105Aarchivetier 2retrieved 2023-09-011 fact on this page
- 4Internet Archivehttps://web.archive.org/web/20230901231740/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Seiko_6106Aarchivetier 2retrieved 2023-09-011 fact on this page
- 5Internet Archivehttps://web.archive.org/web/20230901231752/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Seiko_6106Barchivetier 2retrieved 2023-09-011 fact on this page
- 6Internet Archivehttps://web.archive.org/web/20230901231805/http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Seiko_6117Aarchivetier 2retrieved 2023-09-011 fact on this page