El Primero (Zenith)
authority: zenith7 members
Family line
Rolex 4030
This profile traverses clone_of · derived_from · design_imitation_of · ebauche_of · incorporates_module · licensed_copy_of · module_on · revision_of · tooling_transfer_of · variant_of and keeps disputed edges. Every edge in this view carries at least one reference.
Same caliber, other senses of “family”Heritage · 7 calibersParts cluster (Jules Borel sense) · 1 calibersManufacturer-internal (Ranfft sense) · 1 calibersBased-on star (WatchBase sense) · 7 calibers
Edge types in this family
accepteddisputedcontested region
Generations run left to right, ancestors first, and the axis along the top is ordinal rather than linear: each band is one generation, labelled with the range of sourced introduction years it contains. A band reads “—” when no caliber in it has a year anyone published — the gap is the finding, not a rendering failure. Dotted arcs above and below the drawing are related edges — successor, drop-in, no-derivation — which are stored in a different table from lineage and can never form part of an ancestry path.
Every edge in this view
| Caliber | Relationship | To | Status | Detail | Sources |
|---|---|---|---|---|---|
| Rolex 4030 | derived from lineage | Zenith El Primero 400 | accepted | interchange note: Sourced delta, both sources agreeing: date mechanism REMOVED; balance wheel replaced with a larger free-sprung Glucydur; regulator assembly replaced with Rolex Microstella screws; flat balance spring replaced with a Breguet overcoil; frequency reduced 36,000 -> 28,800 vph; rotor and column wheel redesigned; traditional lubricants reinstated. Roughly 200 modifications, about half the components replaced. NOT a rebadge and NOT a clone — the object is a physically reworked El Primero 400. · component delta: calendar_mechanism,balance_wheel,regulation_method,balance_spring,frequency,automatic_module,complication_module | |
| Zenith El Primero 3600 | derived from lineage | Zenith El Primero 400 | accepted | interchange note: entirely redesigned rather than revised — the source lists what was deliberately PRESERVED (integrated construction, lateral clutch, column wheel, ball-bearing central rotor, 36,000 vph, 1/10 s) and what was added (modularity, optimised industrial production, stop-seconds, 60 h reserve, fewer components) · component delta: main_plate,bridges,gear_train,complication_module | |
| Zenith El Primero 3620 | derived from lineage | Zenith El Primero 3600 | accepted | interchange note: the source calls the 3620 a subsequent variation of the 3600 whose 1/10th-second hand is driven directly by the 5 Hz escapement rather than by the chronograph · component delta: gear_train,complication_module | |
| Zenith El Primero 400 | revision of lineage | Zenith 3019 PHC (El Primero) | accepted | interchange note: the sourced delta is an upgraded shock protection system introduced by 1987, at which point the movement was renumbered 400, "moving beyond the classification inherited from the Martel Watch". The 3019 PHF calendar/moonphase sibling was renumbered 410 in the same move. · component delta: shock_absorber | |
| Zenith El Primero 400 Z | revision of lineage | Zenith El Primero 400 | accepted | interchange note: chronograph bridge redesigned; fourth (seconds) wheel 100 teeth / 5 arms → 120 teeth / 6 arms; escape wheel 21 → 20 teeth; a blade added to the pinion; lever fork horns modified. The same changes were applied to the 405 Z and 420 Z. · component delta: bridges,gear_train,escapement_architecture,pallet_fork | |
| Zenith El Primero 405 | derived from lineage | Zenith El Primero 400 | accepted | interchange note: the source places the 405 inside the El Primero family as an addition to it and applies the 1998 "Z" revision to the 405 as well, which ties it to the 400 line; the specific mechanical delta beyond the flyback function is NOT stated and is not asserted here · component delta: complication_module | |
| design:rolex-4130 | successor of related | Rolex 4030 | accepted | Commercial replacement, NOT descent. Sources describe the 4130 as Rolex's FIRST in-house chronograph and compare it to the 4030 only by contrast — fewer parts, vertical instead of horizontal clutch, longer reserve, sub-dial order changed. No source consulted asserts that the 4130 derives from the 4030 or from the Zenith El Primero, and no lineage edge is authored here. |
Curated overlays
A curated family label is an attributed opinion about grouping, not a node in the graph. No edge can point at one, and membership never affects ancestry.
Sources
- 1Monochrome Watcheshttps://monochrome-watches.com/history-rolex-daytona-chronograph-1963-in-depth-review/presstier 2retrieved 2026-08-242 facts on this page
- 2Monochrome Watcheshttps://monochrome-watches.com/in-depth-the-history-of-the-zenith-el-primero-high-frequency-automatic-chronograph/presstier 2retrieved 2026-08-246 facts on this page
- 3Monochrome Watcheshttps://monochrome-watches.com/zenith-chronomaster-2-the-next-big-step-forward-for-the-el-primero/presstier 2retrieved 2026-08-241 fact on this page
- 4zenith-watches.comhttps://www.zenith-watches.com/en_us/product/defy-extreme-97-9100-9004-80-i209manufacturertier 1retrieved 2026-08-241 fact on this page