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:ap-2121/unknown
accepteddisputed
movement
Audemars Piguet 2121
Audemars Piguet Holding SA · 2002–presentManufacture Jaeger-LeCoultre SA · ?–2002introduced 1970design:ap-2121compare specs · 4
bounding evidence — no range is drawn on the era axis
not after 2022
Audemars Piguet 7121 · introduced 2022 (sourced)
not before 1967
Audemars Piguet 2120 · introduced 1967 (sourced)
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
Audemars Piguet 2121
movementproducer: Audemars Piguet Holding SAproducer: Manufacture Jaeger-LeCoultre SA
IIDesignations — 1 name
| Issuer | Name | Kind | Disambiguated by | Sources |
|---|---|---|---|---|
| Audemars Piguet Holding SA | 2121 | house | the date-bearing execution of the LeCoultre 920 ébauche under AP's house numbering |
IIIExecutions — 1 article
No source in this corpus states which grade any Audemars Piguet 2121 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 | 247 | — | accepted | |
Jewels build.jewel_count | 36 | — | accepted | |
Date disp.has_date | yes | — | accepted | |
Seconds display disp.seconds_display | none | — | accepted | |
Movement diameter geom.diameter_mm | 28.4 mm | — | disputed | |
Movement diameter geom.diameter_mm | 28 mm | — | disputed | |
Movement height geom.height_mm | 3.1 mm | — | disputed | |
Movement height geom.height_mm | 3.05 mm | — | disputed | |
Frequency osc.frequency_vph | 19800 vph | — | accepted | |
Regulation type osc.regulation_type | free_sprung_weights | — | accepted | |
Power reserve (typical) power.reserve_typical_h | 40 h | — | accepted | |
Introduced prod.intro_year | 1970 | — | accepted | |
Quickset date wind.has_quickset_date | no | — | accepted | |
Winding mode wind.mode | automatic | — | accepted | |
Rotor bearing wind.rotor_bearing | jewel_bearing | — | 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 · 2
Where this construction came from. Read up the arrows.
- Audemars Piguet 2120derived from
- Jaeger-LeCoultre 920derived fromébauche 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 · 1
Stored in a different table from descent. A successor is not a child.
- Audemars Piguet 7121successor of
the source calls the 7121 brand new and in-house-developed, and lists its differences from the 2121 as improvements rather than as a derivation. Commercial succession only — this row lives in related_edge and can never be walked into the JLC 920 ancestry.
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.
- Audemars Piguet Holding SA1 modelmodel:audemars-piguet/royal-oak-15202ba
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
- 1Monochrome Watcheshttps://monochrome-watches.com/complete-history-of-the-audemars-piguet-royal-oak-jumbo-series-5402-14802-15002-15202-16202-review/presstier 2retrieved 2026-08-2410 facts on this page
- 2Monochrome Watcheshttps://monochrome-watches.com/audemars-piguet-royal-oak-jumbo-extra-thin-16202st-to-replace-the-15202st-video-review-price/presstier 2retrieved 2026-08-2410 facts on this page
- 3audemarspiguet.comhttps://www.audemarspiguet.com/en/watch-collection/royal-oak/15202ST.OO.1240ST.01.Amanufacturertier 1retrieved 2026-08-249 facts on this page
- 4Fratellohttps://www.fratellowatches.com/audemars-piguet-royal-oak-jumbo-52mondayz-week-26/presstier 2retrieved 2026-08-242 facts on this page
- 5Monochrome Watcheshttps://monochrome-watches.com/history-of-the-audemars-piguet-royal-oak-perpetual-calendar-in-depth-review/presstier 2retrieved 2026-08-242 facts on this page
- 6Monochrome Watcheshttps://monochrome-watches.com/history-patek-philippe-nautilus-part-1-nautilus-3700/presstier 2retrieved 2026-08-241 fact on this page
- 7Monochrome Watcheshttps://monochrome-watches.com/vacheron-constantin-overseas-ultra-thin-2000v-calibre-1120-sihh2016/presstier 2retrieved 2026-08-244 facts on this page
- 8Monochrome Watcheshttps://monochrome-watches.com/2025-vacheron-constantin-traditionnelle-perpetual-calendar-ultra-thin-36mm-non-gemset-editions-review-price/presstier 2retrieved 2026-08-242 facts on this page
- 9Monochrome Watcheshttps://monochrome-watches.com/2025-vacheron-constantin-222-steel-review-historiques-222-blue-dial-steel-luxury-sports-watch-price/presstier 2retrieved 2026-08-241 fact on this page
- 10Monochrome Watcheshttps://monochrome-watches.com/history-vacheron-constantin-overseas-1970s-icon/presstier 2retrieved 2026-08-242 facts on this page