Head-to-Head Comparison

Updated September 5, 2026

Casio MTP-S120L Solar Field vs Casio Pro Trek PRG601-1

Casio's field watch meets Casio's timepiece

Quick Verdict

The Casio MTP-S120L Solar Field ($100–$150) offers Casio Tough Solar Quartz precision in the tier below the Casio Pro Trek PRG601-1 ($250–$500). The MTP-S120L Solar Field measures 42mm (49 x 42 x 10.9mm) and is rated 100m (10 ATM). The Pro Trek PRG601-1 counters with Casio (Japan) craftsmanship and 100m (10 ATM) water resistance. Both are exceptional watches for their respective tiers.

CasioMTP-S120L Solar Field$100–$150 Check price CasioPro Trek PRG601-1$250–$500 Check price

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Casio

MTP-S120L Solar Field

$100–$150

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Casio

Pro Trek PRG601-1

$250–$500

Check Price Full Review

Specifications Compared

Feature	Casio MTP-S120L Solar Field	Casio Pro Trek PRG601-1
Price	$100–$150	$250–$500
Case Size	42mm (49 x 42 x 10.9mm)	51.6mm
Movement	Solar-Powered Quartz	Tough Solar (Solar Quartz)
Caliber Type	Casio Tough Solar Quartz	Tough Solar Quartz (No Battery Change)
Power Reserve	Months on a full solar charge; no battery replacement	7 Months (Solar, Full Charge); 25 Months Power Save
Water Resistance	100m (10 ATM)	100m (10 ATM)
Crystal	Mineral Crystal	Mineral Glass
Case Material	Stainless Steel	Bio-Based Resin / Stainless Steel
Origin	Casio (Japan)	Casio (Japan)

Category-by-Category Analysis

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Design & Aesthetics

Edge: Draw

Casio's design language vs Casio'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 Casio Pro Trek PRG601-1 offers Bio-Based Resin / Stainless Steel construction at 51.6mm with Mineral Glass. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Casio

Solar-Powered Quartz vs Tough Solar (Solar Quartz)

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 Pro Trek PRG601-1 uses the Tough Solar (Solar Quartz) (Tough Solar Quartz (No Battery Change), 7 Months (Solar, Full Charge); 25 Months Power Save reserve) at standard. The Pro Trek PRG601-1 offers a longer power reserve.

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Wearability & Fit

Edge: Casio

42mm (49 x 42 x 10.9mm) vs 51.6mm — different wrist presence

At 42mm (49 x 42 x 10.9mm), the MTP-S120L Solar Field wears more compactly on smaller wrists compared to the Pro Trek PRG601-1 at 51.6mm. Water resistance differs: 100m (10 ATM) vs 100m (10 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 Casio Pro Trek PRG601-1 at $250–$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 Mineral Glass and 7 Months (Solar, Full Charge); 25 Months Power Save on the Pro Trek PRG601-1. Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Draw

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

The MTP-S120L Solar Field is rated to 100m (10 ATM) while the Pro Trek PRG601-1 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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Casio

Pro Trek PRG601-1

Choose the Casio Pro Trek PRG601-1 if you value Tough Solar Quartz (No Battery Change) technology, Casio (Japan) heritage, and 51.6mm proportions. At $250–$500, the Tough Solar (Solar Quartz) with 7 Months (Solar, Full Charge); 25 Months Power Save power reserve makes it a compelling choice.

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The Bottom Line

The Casio MTP-S120L Solar Field and Casio Pro Trek PRG601-1 represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Casio delivers Casio (Japan) engineering.

Frequently Asked Questions

On price, the Casio MTP-S120L Solar Field sits a band lower ($100–$150 against $250–$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 Casio Pro Trek PRG601-1 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 Pro Trek PRG601-1 at 51.6mm with 100m (10 ATM) is similarly capable. The MTP-S120L Solar Field uses Mineral Crystal while the Pro Trek PRG601-1 uses 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.