Head-to-Head Comparison

Updated September 5, 2026

Casio MTP-S120L Solar Field vs Hamilton Khaki Field Mechanical 38mm

Two field watchs compared — $100–$150 vs $500–$1,000

Quick Verdict

The Casio MTP-S120L Solar Field ($100–$150) offers Casio Tough Solar Quartz precision in the tier below the Hamilton Khaki Field Mechanical 38mm ($500–$1,000). The MTP-S120L Solar Field measures 42mm (49 x 42 x 10.9mm) 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 field watchs for their respective tiers.

CasioMTP-S120L Solar Field$100–$150 Check price HamiltonKhaki Field Mechanical 38mm$500–$1,000 Check price

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Casio

MTP-S120L Solar Field

$100–$150

Check Price Full Review

Hamilton

Khaki Field Mechanical 38mm

$500–$1,000

Check Price Full Review

Specifications Compared

Feature	Casio MTP-S120L Solar Field	Hamilton Khaki Field Mechanical 38mm
Price	$100–$150	$500–$1,000
Case Size	42mm (49 x 42 x 10.9mm)	38mm
Movement	Solar-Powered Quartz	Hand-Wound H-50 (ETA 2801-2 base)
Caliber Type	Casio Tough Solar Quartz	Hamilton/ETA Hand-Wound
Power Reserve	Months on a full solar charge; no battery replacement	80 Hours
Water Resistance	100m (10 ATM)	50m (5 ATM)
Crystal	Mineral Crystal	Sapphire Crystal
Case Material	Stainless Steel	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 MTP-S120L Solar Field features a Stainless Steel case at 42mm (49 x 42 x 10.9mm) with Mineral Crystal 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

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

The MTP-S120L Solar Field runs the Solar-Powered Quartz (Casio Tough Solar Quartz, Months on a full solar charge; no battery replacement 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

42mm (49 x 42 x 10.9mm) vs 38mm — different wrist presence

At 42mm (49 x 42 x 10.9mm), the MTP-S120L Solar Field 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 MTP-S120L Solar Field sits at $100–$150 and the Hamilton Khaki Field Mechanical 38mm at $500–$1,000. On the specs that outlast any price: the MTP-S120L Solar Field uses Mineral Crystal with Months on a full solar charge; no battery replacement, 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 MTP-S120L Solar Field is rated to 100m (10 ATM) while the Khaki Field Mechanical 38mm handles 50m (5 ATM). The MTP-S120L Solar Field is better suited for water activities.

Our Verdict

Casio

MTP-S120L Solar Field

Choose the Casio MTP-S120L Solar Field if you prioritize Casio Tough Solar Quartz engineering, Casio (Japan) craftsmanship, and 100m (10 ATM) water resistance. At $100–$150, it delivers Solar-Powered Quartz with Months on a full solar charge; no battery replacement power reserve.

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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.

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The Bottom Line

The Casio MTP-S120L Solar Field and Hamilton Khaki Field Mechanical 38mm represent two distinct approaches to the field watch category — 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 MTP-S120L Solar Field is the better buy if you want solar power and quartz accuracy with no servicing. For water, the Casio MTP-S120L Solar Field 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 MTP-S120L Solar Field sits a band lower ($100–$150 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 MTP-S120L Solar Field offers better upfront value, sitting a tier lower at $100–$150. 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 MTP-S120L Solar Field at 42mm (49 x 42 x 10.9mm) with 100m (10 ATM) water resistance handles everyday situations. The Khaki Field Mechanical 38mm at 38mm with 50m (5 ATM) is similarly capable. The MTP-S120L Solar Field uses Mineral Crystal while the Khaki Field Mechanical 38mm uses Sapphire Crystal. Sapphire resists scratches noticeably better than mineral glass.

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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.