Head-to-Head Comparison

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 44.5mm 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

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Specifications Compared

Feature	Casio MTP-S120L Solar Field	Casio Pro Trek PRG601-1
Price	$100–$150	$250–$500
Case Size	44.5mm	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 44.5mm 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.

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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

44.5mm vs 51.6mm — different wrist presence

At 44.5mm, 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).

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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 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.

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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 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

Neither is objectively better — they serve different preferences. The Casio MTP-S120L Solar Field ($100–$150) offers Solar-Powered Quartz with Months on a full solar charge; no battery replacement power reserve, while the Casio Pro Trek PRG601-1 ($250–$500) features Tough Solar (Solar Quartz) with 100m (10 ATM) water resistance. Choose based on your priorities: Casio (Japan) craftsmanship vs Casio (Japan) engineering.

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 44.5mm 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.