Head-to-Head Comparison

Updated September 5, 2026

Casio MTP-S120L Solar Field vs Junghans Form A Automatic

Casio's field watch meets Junghans's dress watch

Quick Verdict

The Casio MTP-S120L Solar Field ($100–$150) offers Casio Tough Solar Quartz precision in the tier below the Junghans Form A Automatic ($1,000–$1,500). The MTP-S120L Solar Field measures 42mm (49 x 42 x 10.9mm) and is rated 100m (10 ATM). The Form A Automatic counters with Made in Germany craftsmanship and 50m (5 ATM) water resistance. Both are exceptional watches for their respective tiers.

CasioMTP-S120L Solar Field$100–$150 Check price View the dossier

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Casio

MTP-S120L Solar Field

$100–$150

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Junghans

Form A Automatic

$1,000–$1,500

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Specifications Compared

Feature	Casio MTP-S120L Solar Field	Junghans Form A Automatic
Price	$100–$150	$1,000–$1,500
Case Size	42mm (49 x 42 x 10.9mm)	39.3mm
Movement	Solar-Powered Quartz	Automatic J800.2 (ETA 2824-2)
Caliber Type	Casio Tough Solar Quartz	Swiss ETA Base, German-Finished
Power Reserve	Months on a full solar charge; no battery replacement	38 Hours
Water Resistance	100m (10 ATM)	50m (5 ATM)
Crystal	Mineral Crystal	Flat Sapphire with Anti-Reflective Coating
Case Material	Stainless Steel	Stainless Steel
Origin	Casio (Japan)	Made in Germany

Category-by-Category Analysis

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Design & Aesthetics

Edge: Draw

Casio's design language vs Junghans'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 Junghans Form A Automatic offers Stainless Steel construction at 39.3mm with Flat Sapphire with Anti-Reflective Coating. Both represent their brand's distinct design philosophy and heritage.

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Movement & Performance

Edge: Junghans

Solar-Powered Quartz vs Automatic J800.2 (ETA 2824-2)

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 Form A Automatic uses the Automatic J800.2 (ETA 2824-2) (Swiss ETA Base, German-Finished, 38 Hours reserve) at 28,800 vph (4 Hz). The Form A Automatic offers a longer power reserve.

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Wearability & Fit

Edge: Junghans

42mm (49 x 42 x 10.9mm) vs 39.3mm — different wrist presence

At 42mm (49 x 42 x 10.9mm), the MTP-S120L Solar Field has a bolder wrist presence compared to the Form A Automatic at 39.3mm. Water resistance differs: 100m (10 ATM) vs 50m (5 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 Junghans Form A Automatic at $1,000–$1,500. 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 Flat Sapphire with Anti-Reflective Coating and 38 Hours on the Form A Automatic. Service intervals are typically 5-7 years for both.

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Water Resistance

Edge: Casio

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

The MTP-S120L Solar Field is rated to 100m (10 ATM) while the Form A Automatic 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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Junghans

Form A Automatic

Choose the Junghans Form A Automatic if you value Swiss ETA Base, German-Finished technology, Made in Germany heritage, and 39.3mm proportions. At $1,000–$1,500, the Automatic J800.2 (ETA 2824-2) with 38 Hours power reserve makes it a compelling choice.

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The Bottom Line

The Casio MTP-S120L Solar Field and Junghans Form A Automatic represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Junghans delivers Made in Germany engineering.

Frequently Asked Questions

The Junghans Form A Automatic 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 $1,000–$1,500), 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 Junghans Form A Automatic 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 Form A Automatic at 39.3mm with 50m (5 ATM) is similarly capable. The MTP-S120L Solar Field uses Mineral Crystal while the Form A Automatic uses Flat Sapphire with Anti-Reflective Coating. 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.