---
title: "Zenith Chronomaster Open Automatic 39.5mm Stainless Steel 03.3300.3604/21.M3300 2024"
type: "product"
brand: "Zenith"
model: "El Primero Chronomaster"
reference: "03.3300.3604/21.M3300"
price: 5250
currency: "GBP"
condition: "Pre-owned"
year: 2024
category: "Watches"
subcategory: "Zenith"
availability: "In Stock"
url: "https://thediamondbox.co.uk/zenith-chronomaster-open-39mm-steel-03-3300-3604-21-m3300-2024"
image: "https://thediamondbox.co.uk/uploads/original_image/f67a476b25dc864147743182f25c28ef.png"
updated: "2026-10-18"
---

# Zenith Chronomaster Open Automatic 39.5mm Stainless Steel 03.3300.3604/21.M3300 2024

## Price

**£5,250** (Finance available from £493.94/month)

## Description

The 2024 Zenith Chronomaster Open 39.5mm features a black dial features contrasting sub-dials, applied baton hour markers, and elegant hands with luminous accents for excellent legibility, a open-heart dial reveals a portion of the high-frequency automatic movement through a cut-out at 10–11 o’clock, offering a captivating glimpse into the escapement in action. Paired with a matching stainless steel bracelet.The Chronomaster collection traces its roots to Zenith’s pioneering development of high-frequency chronograph calibres, most notably the El Primero — the world’s first automatic chronograph movement introduced in 1969. The “Open” series celebrates this legacy by artfully exposing part of the movement on the dial, bridging technical brilliance with aesthetic intrigue.This watch has been checked against technical records to guarantee authenticity and clean history. Comes with original box and papers.Ref: 03.3300.3604/21.M3300

## Specifications

| Specification | Value |
|---------------|-------|
| Brand | Zenith |
| Reference Number | 03.3300.3604/21.M3300 |
| Year | 2024 |
| Condition | Pre-owned |
| Date on card | 29/05/2024 |
| Watchfinder condition rating | Very Good |
| Location | UK |
| Serial | 610462 |
| Model | El Primero Chronomaster |
| Certified | Yes |
| Papers | Yes |
| Box | Authentic Box |
| Gender | Unisex |
| TDB Limited Lifetime Warranty | Yes |
| Case Size | 39.5mm |
| Strap design | Stainless Steel |
| Material | Stainless Steel |
| Bezel material | Stainless Steel |
| Dial Colour | Black |
| Movement | Automatic |
| Bracelet Size (cm) | 17 |
| Keywords | Zenith Chronomaster, Zenith Open, Zenith 03.3300.3604, Zenith El Primero, Zenith 39.5mm, Zenith steel chronograph |

## About The Diamond Box

The Diamond Box is North London's distinguished destination for luxury watches and gold jewellery since 1997. Visit us at 114 Ballards Lane, N3 2DN, London or call 020 8838 3655.


[View this product on our website](https://thediamondbox.co.uk/zenith-chronomaster-open-39mm-steel-03-3300-3604-21-m3300-2024)