Head-to-Head Comparison

Updated September 5, 2026

Casio MTP-S120L Solar Field vs Tissot Seastar 1000 Automatic

Casio's field watch meets Tissot's diver

Quick Verdict

The Casio MTP-S120L Solar Field ($100–$150) offers Casio Tough Solar Quartz precision in the tier below the Tissot Seastar 1000 Automatic ($500–$1,000). The MTP-S120L Solar Field measures 42mm (49 x 42 x 10.9mm) and is rated 100m (10 ATM). The Seastar 1000 Automatic counters with Swiss Made craftsmanship and 300m (30 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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Tissot

Seastar 1000 Automatic

$500–$1,000

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Specifications Compared

Feature	Casio MTP-S120L Solar Field	Tissot Seastar 1000 Automatic
Price	$100–$150	$500–$1,000
Case Size	42mm (49 x 42 x 10.9mm)	40mm
Movement	Solar-Powered Quartz	Automatic Powermatic 80 (Caliber 80.111)
Caliber Type	Casio Tough Solar Quartz	ETA/Tissot Automatic
Power Reserve	Months on a full solar charge; no battery replacement	80 Hours
Water Resistance	100m (10 ATM)	300m (30 ATM)
Crystal	Mineral Crystal	Sapphire Crystal
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 Tissot'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 Tissot Seastar 1000 Automatic offers Stainless Steel construction at 40mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.

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Movement & Performance

Edge: Tissot

Solar-Powered Quartz vs Automatic Powermatic 80 (Caliber 80.111)

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 Seastar 1000 Automatic uses the Automatic Powermatic 80 (Caliber 80.111) (ETA/Tissot Automatic, 80 Hours reserve) at 21,600 vph (3 Hz). The Seastar 1000 Automatic offers a longer power reserve.

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Wearability & Fit

Edge: Tissot

42mm (49 x 42 x 10.9mm) vs 40mm — different wrist presence

At 42mm (49 x 42 x 10.9mm), the MTP-S120L Solar Field has a bolder wrist presence compared to the Seastar 1000 Automatic at 40mm. Water resistance differs: 100m (10 ATM) vs 300m (30 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 Tissot Seastar 1000 Automatic at $500–$1,000. 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 80 Hours on the Seastar 1000 Automatic. Service intervals are typically 5-7 years for both.

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Water Resistance

Edge: Tissot

100m (10 ATM) vs 300m (30 ATM)

The MTP-S120L Solar Field is rated to 100m (10 ATM) while the Seastar 1000 Automatic handles 300m (30 ATM). The Seastar 1000 Automatic 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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Tissot

Seastar 1000 Automatic

Choose the Tissot Seastar 1000 Automatic if you value ETA/Tissot Automatic technology, Swiss Made heritage, and 40mm proportions. At $500–$1,000, the Automatic Powermatic 80 (Caliber 80.111) with 80 Hours power reserve makes it a compelling choice.

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The Bottom Line

The Casio MTP-S120L Solar Field and Tissot Seastar 1000 Automatic represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Tissot delivers Swiss Made engineering.

Frequently Asked Questions

The Tissot Seastar 1000 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 Tissot Seastar 1000 Automatic is rated 300 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 $500–$1,000), 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 Tissot Seastar 1000 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 Seastar 1000 Automatic at 40mm with 300m (30 ATM) is similarly capable. The MTP-S120L Solar Field uses Mineral Crystal while the Seastar 1000 Automatic 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.