Casio Pro Trek PRG340-1 vs Zenith Chronomaster El Primero
Casio's timepiece meets Zenith's chronograph
Quick Verdict
The Casio Pro Trek PRG340-1 ($150–$250) offers Tough Solar Quartz (No Battery Change) precision in the tier below the Zenith Chronomaster El Primero ($5,000–$10,000). The Pro Trek PRG340-1 measures 54.7 × 51.7 × 15.1mm and is rated 100m (10 ATM). The Chronomaster El Primero counters with Swiss Made craftsmanship and 50m (5 ATM) water resistance. Both are exceptional watches for their respective tiers.
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Specifications Compared
| Feature | Casio Pro Trek PRG340-1 | Zenith Chronomaster El Primero |
|---|---|---|
| Price | $150–$250 | $5,000–$10,000 |
| Case Size | 54.7 × 51.7 × 15.1mm | 38mm |
| Movement | Tough Solar (Solar Quartz) | Automatic El Primero 3600 (5Hz) |
| Caliber Type | Tough Solar Quartz (No Battery Change) | In-House Automatic Chronograph Manufacture |
| Power Reserve | Tough Solar (Rechargeable) | 60 Hours |
| Water Resistance | 100m (10 ATM) | 50m (5 ATM) |
| Crystal | Mineral Glass | Domed Sapphire |
| Case Material | Bio-Based Resin | Stainless Steel |
| Origin | Casio (Japan) | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Zenith's approach
The Casio Pro Trek PRG340-1 features a Bio-Based Resin case at 54.7 × 51.7 × 15.1mm with Mineral Glass protection. The Zenith Chronomaster El Primero offers Stainless Steel construction at 38mm with Domed Sapphire. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Tough Solar (Solar Quartz) vs Automatic El Primero 3600 (5Hz)
The Pro Trek PRG340-1 runs the Tough Solar (Solar Quartz) (Tough Solar Quartz (No Battery Change), Tough Solar (Rechargeable) power reserve) at standard frequency. The Chronomaster El Primero uses the Automatic El Primero 3600 (5Hz) (In-House Automatic Chronograph Manufacture, 60 Hours reserve) at 36,000 vph (5 Hz). The Chronomaster El Primero offers a longer power reserve.
Wearability & Fit
54.7 × 51.7 × 15.1mm vs 38mm — different wrist presence
At 54.7 × 51.7 × 15.1mm, the Pro Trek PRG340-1 has a bolder wrist presence compared to the Chronomaster El Primero at 38mm. Water resistance differs: 100m (10 ATM) vs 50m (5 ATM).
Value & Cost of Ownership
Casio sits in the lower tier
The Casio Pro Trek PRG340-1 sits at $150–$250 and the Zenith Chronomaster El Primero at $5,000–$10,000. On the specs that outlast any price: the Pro Trek PRG340-1 uses Mineral Glass with Tough Solar (Rechargeable), against Domed Sapphire and 60 Hours on the Chronomaster El Primero. Service intervals are typically 5-7 years for both.
Water Resistance
100m (10 ATM) vs 50m (5 ATM)
The Pro Trek PRG340-1 is rated to 100m (10 ATM) while the Chronomaster El Primero handles 50m (5 ATM). The Pro Trek PRG340-1 is better suited for water activities.
Our Verdict
Casio
Pro Trek PRG340-1
Choose the Casio Pro Trek PRG340-1 if you prioritize Tough Solar Quartz (No Battery Change) engineering, Casio (Japan) craftsmanship, and 100m (10 ATM) water resistance. At $150–$250, it delivers Tough Solar (Solar Quartz) with Tough Solar (Rechargeable) power reserve.
Check Price on AmazonZenith
Chronomaster El Primero
Choose the Zenith Chronomaster El Primero if you value In-House Automatic Chronograph Manufacture technology, Swiss Made heritage, and 38mm proportions. At $5,000–$10,000, the Automatic El Primero 3600 (5Hz) with 60 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio Pro Trek PRG340-1 and Zenith Chronomaster El Primero represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Zenith delivers Swiss Made engineering.
Frequently Asked Questions
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How This Page Was Made
Our comparisons are generated from a hand-maintained specification database and reviewed under our editorial standards. We use AI tools to assemble pages from that data. We don’t invent specs: every number traces back to the database, and when we correct an entry, the fix is applied site-wide. As an Amazon Associate, The Horologist earns from qualifying purchases.