Zenith
Zenith El Primero Chronomaster Full Open 38 Stainless Steel / Rose Gold / Alligator 51.2151.400/78.C810
The Zenith El Primero Chronomaster Full Open 38 Stainless Steel / Rose Gold / Alligator (reference 51.2151.400/78.C810) is a stainless steel watch.
Specifications
Case
- Reference
- 51.2151.400/78.C810
- Collection
- El Primero
- Case material
- Stainless steel
- Bracelet / strap
- Alligator strap
Dial versions
This reference was made with these dials and finishes.
51.2151.400/78.C810
How it compares within the El Primero family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| 51.2151.400/78.C810 (This watch) | — | Stainless steel | — | — | — |
| 03.2041.4061/55.C496 | — | — | — | — | — |
| 03.2042.4061/21.R576 | — | Stainless steel | Black | — | — |
| 03.2150.400/26.C714 | — | Stainless steel | Slate | — | — |
| A3817 | — | — | — | — | — |
| A3818 | — | — | — | — | — |
| A384 | — | — | — | — | — |
| A385 | — | — | — | — | — |
| A386 | 38 mm | Stainless steel | — | El Primero 3019 PHC | 1969–1972 |
About the El Primero family
The El Primero was introduced in 1969 as one of the first automatic chronograph calibers, beating at 36,000 vibrations per hour so it can time to a tenth of a second. The first watches, such as ref. A386 with its tri-colour counters, are among the most collected Zenith models.
This heading holds more than a hundred and fifty El Primero references from the 2000s and 2010s, such as the El Primero 36'000 VpH, Chronomaster 1969 and Original 1969 models, in steel, gold, ceramic and aluminium. Dealers identify the model and caliber from the reference and check the chronograph functions and papers.
Quick answers
- What is the Zenith El Primero Chronomaster Full Open 38 Stainless Steel / Rose Gold / Alligator 51.2151.400/78.C810 made of?
- The case is stainless steel. Bracelet or strap: Alligator strap.
Catalog facts checked October 2026.