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:citizen-7500a/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
Citizen 7500A
bounding evidence — no range is drawn on the era axis
not after 1980
a dated example movement, ca. 1975 (+5 yr, the source says “circa”)“ca. 1975: Citizen, Japan, 16 J.; Parashock”
not after 1980
a dated example movement, ca. 1975 (+5 yr, the source says “circa”)“ca. 1975: Citizen, Japan, 16 J.; Parashock”
not after 1980
a dated example movement, ca. 1975 (+5 yr, the source says “circa”)“ca. 1975: Citizen, Japan, 16 J.; Parashock”
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
Citizen 7500A
movementproducer: Citizen Watch Co., Ltd.archive filing
IIDesignations — 0 names
No designation is recorded for this design yet.
IIIExecutions — 1 article
No source in this corpus states which grade any Citizen 7500A 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 | 16 | — | staged | |
Movement shape build.shape | rectangular | — | staged | |
Date disp.has_date | yes | — | staged | |
Day disp.has_day | yes | — | staged | |
Seconds display disp.seconds_display | central | — | staged | |
Movement height geom.height_mm | 4.58 mm | — | staged | |
Frequency osc.frequency_vph | 18000 vph | — | staged | |
Shock protection osc.shock_protection | parashock | example movement, 1975 | 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/20120417011852/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Citizen_7500Aarchivetier 2retrieved 2012-04-1710 facts on this page
- 2Internet Archivehttps://web.archive.org/web/20120416114454/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Citizen_7501A&archivetier 2retrieved 2012-04-161 fact on this page
- 3Internet Archivehttps://web.archive.org/web/20120419162956/http://www.ranfft.de/cgi-bin/bidfun-db.cgi?03&ranfft&0&2uswk&Citizen_7510Aarchivetier 2retrieved 2012-04-191 fact on this page