Head-to-Head Comparison

Updated September 5, 2026

Casio MTP-S120L Solar Field vs Frederique Constant Highlife Automatic COSC

Casio's field watch meets Frederique Constant's timepiece

Quick Verdict

The Casio MTP-S120L Solar Field ($100–$150) offers Casio Tough Solar Quartz precision in the tier below the Frederique Constant Highlife Automatic COSC ($1,500–$2,500). The MTP-S120L Solar Field measures 42mm (49 x 42 x 10.9mm) and is rated 100m (10 ATM). The Highlife Automatic COSC counters with Swiss Made craftsmanship and 100m (10 ATM) water resistance. Both are exceptional watches for their respective tiers.

CasioMTP-S120L Solar Field$100–$150 Check price Frederique ConstantHighlife Automatic COSC$1,500–$2,500 Check price

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Casio

MTP-S120L Solar Field

$100–$150

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Frederique Constant

Highlife Automatic COSC

$1,500–$2,500

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Specifications Compared

Feature	Casio MTP-S120L Solar Field	Frederique Constant Highlife Automatic COSC
Price	$100–$150	$1,500–$2,500
Case Size	42mm (49 x 42 x 10.9mm)	39mm
Movement	Solar-Powered Quartz	Automatic FC-303 (COSC)
Caliber Type	Casio Tough Solar Quartz	COSC-Certified Automatic
Power Reserve	Months on a full solar charge; no battery replacement	38 Hours
Water Resistance	100m (10 ATM)	100m (10 ATM)
Crystal	Mineral Crystal	Convex Sapphire
Case Material	Stainless Steel	Stainless Steel
Origin	Casio (Japan)	Swiss Made

Category-by-Category Analysis

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Design & Aesthetics

Edge: Draw

Casio's design language vs Frederique Constant'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 Frederique Constant Highlife Automatic COSC offers Stainless Steel construction at 39mm with Convex Sapphire. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Frederique Constant

Solar-Powered Quartz vs Automatic FC-303 (COSC)

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 Highlife Automatic COSC uses the Automatic FC-303 (COSC) (COSC-Certified Automatic, 38 Hours reserve) at 28,800 vph (4 Hz). The Highlife Automatic COSC offers a longer power reserve.

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Wearability & Fit

Edge: Frederique Constant

42mm (49 x 42 x 10.9mm) vs 39mm — different wrist presence

At 42mm (49 x 42 x 10.9mm), the MTP-S120L Solar Field has a bolder wrist presence compared to the Highlife Automatic COSC at 39mm. Water resistance differs: 100m (10 ATM) vs 100m (10 ATM).

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Value & Cost of Ownership

Edge: Casio

Casio sits in the lower tier

The Casio MTP-S120L Solar Field sits at $100–$150 and the Frederique Constant Highlife Automatic COSC at $1,500–$2,500. 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 Convex Sapphire and 38 Hours on the Highlife Automatic COSC. Service intervals are typically 5-7 years for both.

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Water Resistance

Edge: Draw

100m (10 ATM) vs 100m (10 ATM)

The MTP-S120L Solar Field is rated to 100m (10 ATM) while the Highlife Automatic COSC handles 100m (10 ATM). Both offer identical water resistance ratings.

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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Frederique Constant

Highlife Automatic COSC

Choose the Frederique Constant Highlife Automatic COSC if you value COSC-Certified Automatic technology, Swiss Made heritage, and 39mm proportions. At $1,500–$2,500, the Automatic FC-303 (COSC) with 38 Hours power reserve makes it a compelling choice.

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The Bottom Line

The Casio MTP-S120L Solar Field and Frederique Constant Highlife Automatic COSC represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Frederique Constant delivers Swiss Made engineering.

Frequently Asked Questions

The Frederique Constant Highlife Automatic COSC 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. On price, the Casio MTP-S120L Solar Field sits a band lower ($100–$150 against $1,500–$2,500), 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 Frederique Constant Highlife Automatic COSC 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 Highlife Automatic COSC at 39mm with 100m (10 ATM) is similarly capable. The MTP-S120L Solar Field uses Mineral Crystal while the Highlife Automatic COSC uses Convex Sapphire. 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.