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:patek-philippe-ch-28-520-qa-24h/unknown
accepteddisputed
movement
Patek Philippe CH 28-520 QA 24H
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
Patek Philippe CH 28-520 QA 24H
movementproducer: Patek Philippe
IIDesignations — 0 names
No designation is recorded for this design yet.
IIIExecutions — 1 article
No source in this corpus states which grade any Patek Philippe CH 28-520 QA 24H 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 |
|---|---|---|---|---|
Total components build.component_count | 402 | — | accepted | |
Jewels build.jewel_count | 37 | — | accepted | |
Calendar class cmpl.calendar_class | annual | — | accepted | |
Chronograph minute counter cmpl.chrono_minute_counter | subdial_60 | — | accepted | |
Chronograph cmpl.has_chronograph | yes | — | accepted | |
Flyback cmpl.has_flyback | yes | — | accepted | |
Movement diameter geom.diameter_mm | 33 mm | — | accepted | |
Movement height geom.height_mm | 7.68 mm | — | accepted | |
Frequency osc.frequency_vph | 28800 vph | — | accepted | |
Hairspring brand name osc.hairspring_brand_name | Spiromax | — | accepted | |
Power reserve (minimum) power.reserve_min_h | 45 h | — | accepted | |
Winding mode wind.mode | automatic | — | accepted | |
Rotor architecture wind.rotor_architecture | central | — | accepted |
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.
- Patek Philippe CH 28-520 Cvariant of
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.
Used by
1
models
1
brands
1
grade unknown
grain 1 reference — every record here sits at the same level, so the count is one kind of thing.
- Patek Philippe1 modelmodel:patek-philippe/complications-5905-1a-001
Every brand here is on the strength of a source that names a watch and states this movement. Brands that use this caliber and nobody has sourced yet are absent — this is what has been researched, not what exists.
Sources
- 1patek.comhttps://www.patek.com/en/collection/complications/5905-1a-001manufacturertier 1retrieved 2026-08-2415 facts on this page
- 2patek.comhttps://www.patek.com/en/collection/complications/5935a-001manufacturertier 1retrieved 2026-08-241 fact on this page
- 3patek.comhttps://www.patek.com/en/collection/nautilus/5980-60g-001manufacturertier 1retrieved 2026-08-242 facts on this page