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-l121-1/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
A. Lange & Söhne L121.1
bounding evidence — no range is drawn on the era axis
not before 1994
A. Lange & Söhne L901.0 · introduced 1994 (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 L121.1
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 L121.1 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 | 368 | — | accepted | |
Date display disp.date_display_type | big_date | — | accepted | |
Date switching disp.date_switching_class | instantaneous | — | accepted | |
Power-reserve indicator disp.has_power_reserve_indicator | yes | — | accepted | |
Movement diameter geom.diameter_mm | 30.6 mm | — | accepted | |
Movement height geom.height_mm | 5.7 mm | — | accepted | |
Main-plate material mat.plate_material | german_silver | — | accepted | |
Swiss movement origin.swiss_movement | no | — | accepted | |
Frequency osc.frequency_vph | 21600 vph | — | accepted | |
Hairspring supplier osc.hairspring_supplier | agent:a-lange-sohne | — | accepted | |
Regulation type osc.regulation_type | free_sprung_weights | — | accepted | |
Barrels power.barrel_count | 2 | — | accepted | |
Power reserve (typical) power.reserve_typical_h | 72 h | — | accepted | |
Introduced prod.intro_year | 2015 | — | 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 · 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 · 1
Stored in a different table from descent. A successor is not a child.
- A. Lange & Söhne L901.0successor 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
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.
- A. Lange & Söhne1 modelmodel:a-lange-sohne/lange-1-25th-anniversary
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 2026-08-244 facts on this page
- 2Monochrome Watcheshttps://monochrome-watches.com/comparing-the-old-and-the-new-a-lange-sohne-lange-1-live-pics-specs-price/presstier 2retrieved 2026-08-248 facts on this page
- 3alange-soehne.comhttps://www.alange-soehne.com/us-en/timepieces/lange-1/lange-1/lange-1-in-750-white-gold-191-039manufacturertier 1retrieved 2026-08-246 facts on this page
- 4Monochrome Watcheshttps://monochrome-watches.com/in-depth-ultimate-guide-to-the-a-lange-sohne-lange-1-collection-incl-video/presstier 2retrieved 2026-08-245 facts on this page