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:lange-l901-0/unknown
accepteddisputed
movement
A. Lange & Söhne L901.0
bounding evidence — no range is drawn on the era axis
not after 2015
A. Lange & Söhne L121.1 · introduced 2015 (sourced)
not before 1992
Jaeger-LeCoultre 822 · introduced 1992 (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
A. Lange & Söhne L901.0
movementproducer: A. Lange & Söhne
IIDesignations — 0 names
No designation is recorded for this design yet.
IIIExecutions — 1 article
No source in this corpus states which grade any A. Lange & Söhne L901.0 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 |
|---|---|---|---|---|
Bridge layout build.bridge_layout | three_quarter | — | accepted | |
Total components build.component_count | 365 | — | accepted | |
Date display disp.date_display_type | big_date | — | accepted | |
Date switching disp.date_switching_class | dragging | — | accepted | |
Movement diameter geom.diameter_mm | 30.4 mm | L901.1 | accepted | |
Movement height geom.height_mm | 5.9 mm | L901.1 | accepted | |
Main-plate material mat.plate_material | german_silver | — | accepted | |
Swiss movement origin.swiss_movement | no | — | accepted | |
Balance type osc.balance_type | screwed | — | accepted | |
Frequency osc.frequency_vph | 21600 vph | — | accepted | |
Regulation type osc.regulation_type | index_swan_neck | — | accepted | |
Barrels power.barrel_count | 2 | — | accepted | |
Power reserve (typical) power.reserve_typical_h | 72 h | — | accepted | |
Discontinued prod.discontinued_year | 2014 | — | accepted | |
Introduced prod.intro_year | 1994 | — | accepted | |
Caliber supply type prod.supply_type | in_house | — | accepted | |
Winding mode wind.mode | manual | — | 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.
- Jaeger-LeCoultre 822derived from
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.
- A. Lange & Söhne L121.1successor of
Replaced the L901.0 in the Lange 1 from 2015; same 38.5 mm case, same dial layout, same 72 h from twin barrels. What changed: balance position, plate architecture, gear train, oscillator and date switching.
Used by
2
models
1
brands
2
grade unknown
grain 2 reference — every record here sits at the same level, so the count is one kind of thing.
- A. Lange & Söhne2 modelsmodel:a-lange-sohne/lange-1model:a-lange-sohne/little-lange-1
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
- 1alange-soehne.comhttps://www.alange-soehne.com/us-en/manufacture/art-of-watchmaking/manufacture-movementsmanufacturertier 1retrieved 2026-08-243 facts on this page
- 2alange-soehne.comhttps://www.alange-soehne.com/us-en/manufacture/art-of-watchmaking/three-quarter-platemanufacturertier 1retrieved 2026-08-242 facts on this page
- 3Monochrome Watcheshttps://monochrome-watches.com/in-depth-ultimate-guide-to-the-a-lange-sohne-lange-1-collection-incl-video/presstier 2retrieved 2026-08-2410 facts on this page
- 4alange-soehne.comhttps://www.alange-soehne.com/us-en/timepieces/lange-1/lange-1-luminous/lange-1-luminous-in-750-white-gold-101-029manufacturertier 1retrieved 2026-08-244 facts on this page
- 5Monochrome Watcheshttps://monochrome-watches.com/comparing-the-old-and-the-new-a-lange-sohne-lange-1-live-pics-specs-price/presstier 2retrieved 2026-08-246 facts on this page
- 6Monochrome Watcheshttps://monochrome-watches.com/history-jaeger-lecoultre-reverso-reversible-watch-1931-in-depth-review/presstier 2retrieved 2026-08-241 fact on this page