Head-to-Head Comparison

Updated September 5, 2026

Casio Pro Trek PRG340-1 vs Hamilton Khaki Field Mechanical 38mm

Casio's timepiece meets Hamilton's field watch

Quick Verdict

The Casio Pro Trek PRG340-1 ($150–$250) offers Tough Solar Quartz (No Battery Change) precision in the tier below the Hamilton Khaki Field Mechanical 38mm ($500–$1,000). The Pro Trek PRG340-1 measures 54.7 × 51.7 × 15.1mm and is rated 100m (10 ATM). The Khaki Field Mechanical 38mm counters with Swiss Made craftsmanship and 50m (5 ATM) water resistance. Both are exceptional watches for their respective tiers.

CasioPro Trek PRG340-1$150–$250 Check price HamiltonKhaki Field Mechanical 38mm$500–$1,000 Check price

Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.

Casio

Pro Trek PRG340-1

$150–$250

Check Price Full Review

Hamilton

Khaki Field Mechanical 38mm

$500–$1,000

Check Price Full Review

Specifications Compared

Feature	Casio Pro Trek PRG340-1	Hamilton Khaki Field Mechanical 38mm
Price	$150–$250	$500–$1,000
Case Size	54.7 × 51.7 × 15.1mm	38mm
Movement	Tough Solar (Solar Quartz)	Hand-Wound H-50 (ETA 2801-2 base)
Caliber Type	Tough Solar Quartz (No Battery Change)	Hamilton/ETA Hand-Wound
Power Reserve	Tough Solar (Rechargeable)	80 Hours
Water Resistance	100m (10 ATM)	50m (5 ATM)
Crystal	Mineral Glass	Sapphire Crystal
Case Material	Bio-Based Resin	Stainless Steel
Origin	Casio (Japan)	Swiss Made

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Casio's design language vs Hamilton'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 Hamilton Khaki Field Mechanical 38mm offers Stainless Steel construction at 38mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Hamilton

Tough Solar (Solar Quartz) vs Hand-Wound H-50 (ETA 2801-2 base)

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 Khaki Field Mechanical 38mm uses the Hand-Wound H-50 (ETA 2801-2 base) (Hamilton/ETA Hand-Wound, 80 Hours reserve) at 21,600 vph (3 Hz). The Khaki Field Mechanical 38mm offers a longer power reserve.

📏

Wearability & Fit

Edge: Hamilton

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 Khaki Field Mechanical 38mm at 38mm. Water resistance differs: 100m (10 ATM) vs 50m (5 ATM).

💰

Value & Cost of Ownership

Edge: Casio

Casio sits in the lower tier

The Casio Pro Trek PRG340-1 sits at $150–$250 and the Hamilton Khaki Field Mechanical 38mm at $500–$1,000. On the specs that outlast any price: the Pro Trek PRG340-1 uses Mineral Glass with Tough Solar (Rechargeable), against Sapphire Crystal and 80 Hours on the Khaki Field Mechanical 38mm. Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Casio

100m (10 ATM) vs 50m (5 ATM)

The Pro Trek PRG340-1 is rated to 100m (10 ATM) while the Khaki Field Mechanical 38mm 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 Amazon

Hamilton

Khaki Field Mechanical 38mm

Choose the Hamilton Khaki Field Mechanical 38mm if you value Hamilton/ETA Hand-Wound technology, Swiss Made heritage, and 38mm proportions. At $500–$1,000, the Hand-Wound H-50 (ETA 2801-2 base) with 80 Hours power reserve makes it a compelling choice.

Check Price on Amazon

Try Prime Free — Free Shipping on Both Watches Students & 18–24: start Prime for Young Adults free

The Bottom Line

The Casio Pro Trek PRG340-1 and Hamilton Khaki Field Mechanical 38mm represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Hamilton delivers Swiss Made engineering.

Frequently Asked Questions

The Hamilton Khaki Field Mechanical 38mm is the better buy if you want a mechanical movement; the Casio Pro Trek PRG340-1 is the better buy if you want solar power and quartz accuracy with no servicing. For water, the Casio Pro Trek PRG340-1 is rated 100 m against 50 m, which is the difference between swimming and diving on one side and splashes on the other. On price, the Casio Pro Trek PRG340-1 sits a band lower ($150–$250 against $500–$1,000), so it is the cheaper way into the category. Neither is better at everything; the spec table above shows movement, case size, water resistance and crystal side by side so you can weigh what matters to you. We do not test units, so this is the makers' data, not a bench result.

The Casio Pro Trek PRG340-1 offers better upfront value, sitting a tier lower at $150–$250. However, the Hamilton Khaki Field Mechanical 38mm may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The Pro Trek PRG340-1 at 54.7 × 51.7 × 15.1mm with 100m (10 ATM) water resistance handles everyday situations. The Khaki Field Mechanical 38mm at 38mm with 50m (5 ATM) is similarly capable. The Pro Trek PRG340-1 uses Mineral Glass while the Khaki Field Mechanical 38mm uses Sapphire Crystal. Sapphire resists scratches noticeably better than mineral glass.

More Comparisons

Hamilton Khaki Field Mechanical vs Tissot Le Locle

Wind it yourself, or let it wind itself

Hamilton Khaki Field Mechanical vs Longines HydroConquest

A hand-wound field watch against a 300m Swiss diver

Hamilton Khaki Field Mechanical vs Seiko 5 Sports

Hand-wound Swiss or self-winding Japanese

Explore These Watches

Casio Pro Trek PRG340-1 — Full Review Hamilton Khaki Field Mechanical 38mm — Full Review Browse All Guides

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.