Head-to-Head Comparison

Casio MTP-S120L Solar Field vs Invicta Pro Diver Automatic 23681

Casio's field watch meets Invicta's diver

Quick Verdict

The Invicta Pro Diver Automatic 23681 ($50–$100) delivers Automatic (Seiko NH35A) technology in the tier below the Casio MTP-S120L Solar Field ($100–$150). The Pro Diver Automatic 23681 measures 40mm and is rated 200m. The MTP-S120L Solar Field justifies its premium with Casio (Japan) heritage and Solar-Powered Quartz. Both represent excellent choices in the luxury watch category.

CasioMTP-S120L Solar Field$100–$150 Check price InvictaPro Diver Automatic 23681$50–$100 Check price

Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.

Casio

MTP-S120L Solar Field

$100–$150

Check Price Full Review

Invicta

Pro Diver Automatic 23681

$50–$100

Check Price Full Review

Specifications Compared

Feature	Casio MTP-S120L Solar Field	Invicta Pro Diver Automatic 23681
Price	$100–$150	$50–$100
Case Size	44.5mm	40mm
Movement	Solar-Powered Quartz	Automatic NH35A
Caliber Type	Casio Tough Solar Quartz	Automatic (Seiko NH35A)
Power Reserve	Months on a full solar charge; no battery replacement	—
Water Resistance	100m (10 ATM)	200m
Crystal	Mineral Crystal	Mineral Glass
Case Material	Stainless Steel	—
Origin	Casio (Japan)	Invicta (Japanese movement)

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Casio's design language vs Invicta's approach

The Casio MTP-S120L Solar Field features a Stainless Steel case at 44.5mm with Mineral Crystal protection. The Invicta Pro Diver Automatic 23681 offers steel construction at 40mm with Mineral Glass. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Draw

Solar-Powered Quartz vs Automatic NH35A

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 Diver Automatic 23681 uses the Automatic NH35A (Automatic (Seiko NH35A), standard reserve) at standard. Power reserves are closely matched.

📏

Wearability & Fit

Edge: Invicta

44.5mm vs 40mm — different wrist presence

At 44.5mm, the MTP-S120L Solar Field has a bolder wrist presence compared to the Pro Diver Automatic 23681 at 40mm. Water resistance differs: 100m (10 ATM) vs 200m.

💰

Value & Cost of Ownership

Edge: Invicta

Invicta sits in the lower tier

The Casio MTP-S120L Solar Field sits at $100–$150 and the Invicta Pro Diver Automatic 23681 at $50–$100. 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 a standard reserve on the Pro Diver Automatic 23681. Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Invicta

100m (10 ATM) vs 200m

The MTP-S120L Solar Field is rated to 100m (10 ATM) while the Pro Diver Automatic 23681 handles 200m. The Pro Diver Automatic 23681 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.

Check Price on Amazon

Invicta

Pro Diver Automatic 23681

Choose the Invicta Pro Diver Automatic 23681 if you value Automatic (Seiko NH35A) technology, Invicta (Japanese movement) heritage, and 40mm proportions. At $50–$100, the Automatic NH35A with ample power reserve makes it a compelling choice.

Check Price on Amazon

Try Prime Free — Free Shipping on Both Watches Students & 18–24: start Prime for Young Adults free

The Bottom Line

The Casio MTP-S120L Solar Field and Invicta Pro Diver Automatic 23681 represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Invicta delivers Invicta (Japanese movement) 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 Invicta Pro Diver Automatic 23681 ($50–$100) features Automatic NH35A with 200m water resistance. Choose based on your priorities: Casio (Japan) craftsmanship vs Invicta (Japanese movement) engineering.

The Invicta Pro Diver Automatic 23681 offers better upfront value, sitting a tier lower at $50–$100. However, the Casio MTP-S120L Solar Field 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 Diver Automatic 23681 at 40mm with 200m is similarly capable. The MTP-S120L Solar Field uses Mineral Crystal while the Pro Diver Automatic 23681 uses Mineral Glass.

More Comparisons

Tag Heuer Carrera Chronograph vs Casio MTP-S120L Solar Field

Tag Heuer's chronograph meets Casio's field watch

Tag Heuer Carrera Chronograph vs Invicta Pro Diver Automatic 23681

Tag Heuer's chronograph meets Invicta's diver

Tissot PRX Powermatic 80 vs Casio MTP-S120L Solar Field

Tissot's timepiece meets Casio's field watch

Explore These Watches

Casio MTP-S120L Solar Field — Full Review Invicta Pro Diver Automatic 23681 — Full Review Browse All Guides

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.