Head-to-Head Comparison

Updated September 5, 2026

Casio MTP-S120L Solar Field vs Orient Kamasu Automatic Diver

Casio's field watch meets Orient's diver

Quick Verdict

The Casio MTP-S120L Solar Field ($100–$150) offers Casio Tough Solar Quartz precision in the tier below the Orient Kamasu Automatic Diver ($250–$500). The MTP-S120L Solar Field measures 42mm (49 x 42 x 10.9mm) and is rated 100m (10 ATM). The Kamasu Automatic Diver counters with Made in Japan craftsmanship and 200m (20 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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Orient

Kamasu Automatic Diver

$250–$500

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Specifications Compared

Feature	Casio MTP-S120L Solar Field	Orient Kamasu Automatic Diver
Price	$100–$150	$250–$500
Case Size	42mm (49 x 42 x 10.9mm)	41.8mm
Movement	Solar-Powered Quartz	Automatic Caliber F6922
Caliber Type	Casio Tough Solar Quartz	Orient In-House Automatic
Power Reserve	Months on a full solar charge; no battery replacement	40 Hours
Water Resistance	100m (10 ATM)	200m (20 ATM)
Crystal	Mineral Crystal	Sapphire Crystal
Case Material	Stainless Steel	Stainless Steel
Origin	Casio (Japan)	Made in Japan

Category-by-Category Analysis

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Design & Aesthetics

Edge: Draw

Casio's design language vs Orient'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 Orient Kamasu Automatic Diver offers Stainless Steel construction at 41.8mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Orient

Solar-Powered Quartz vs Automatic Caliber F6922

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 Kamasu Automatic Diver uses the Automatic Caliber F6922 (Orient In-House Automatic, 40 Hours reserve) at 21,600 vph (3 Hz). The Kamasu Automatic Diver offers a longer power reserve.

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Wearability & Fit

Edge: Orient

42mm (49 x 42 x 10.9mm) vs 41.8mm — different wrist presence

At 42mm (49 x 42 x 10.9mm), the MTP-S120L Solar Field has a bolder wrist presence compared to the Kamasu Automatic Diver at 41.8mm. Water resistance differs: 100m (10 ATM) vs 200m (20 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 Orient Kamasu Automatic Diver 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 Sapphire Crystal and 40 Hours on the Kamasu Automatic Diver. Service intervals are typically 5-7 years for both.

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Water Resistance

Edge: Orient

100m (10 ATM) vs 200m (20 ATM)

The MTP-S120L Solar Field is rated to 100m (10 ATM) while the Kamasu Automatic Diver handles 200m (20 ATM). The Kamasu Automatic Diver offers superior water resistance.

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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Orient

Kamasu Automatic Diver

Choose the Orient Kamasu Automatic Diver if you value Orient In-House Automatic technology, Made in Japan heritage, and 41.8mm proportions. At $250–$500, the Automatic Caliber F6922 with 40 Hours power reserve makes it a compelling choice.

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The Bottom Line

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

Frequently Asked Questions

The Orient Kamasu Automatic Diver 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 Orient Kamasu Automatic Diver is rated 200 m against 100 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 $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 Orient Kamasu Automatic Diver 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 Kamasu Automatic Diver at 41.8mm with 200m (20 ATM) is similarly capable. The MTP-S120L Solar Field uses Mineral Crystal while the Kamasu Automatic Diver 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.