Head-to-Head Comparison

Updated September 5, 2026

Casio Pro Trek PRG340-1 vs Orient Sun & Moon

Casio's timepiece meets Orient's dress watch

Quick Verdict

The Casio Pro Trek PRG340-1 ($150–$250) offers Tough Solar Quartz (No Battery Change) precision in the tier below the Orient Sun & Moon ($250–$500). The Pro Trek PRG340-1 measures 54.7 × 51.7 × 15.1mm and is rated 100m (10 ATM). The Sun & Moon counters with Made in Japan craftsmanship and 50m (5 ATM) water resistance. Both are exceptional watches for their respective tiers.

CasioPro Trek PRG340-1$150–$250 Check price View the dossier

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Casio

Pro Trek PRG340-1

$150–$250

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Orient

Sun & Moon

$250–$500

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Specifications Compared

Feature	Casio Pro Trek PRG340-1	Orient Sun & Moon
Price	$150–$250	$250–$500
Case Size	54.7 × 51.7 × 15.1mm	41.5mm
Movement	Tough Solar (Solar Quartz)	Automatic Caliber F6B24
Caliber Type	Tough Solar Quartz (No Battery Change)	Orient In-House Automatic (Hacking, Hand-Winding)
Power Reserve	Tough Solar (Rechargeable)	40 Hours
Water Resistance	100m (10 ATM)	50m (5 ATM)
Crystal	Mineral Glass	Mineral Glass
Case Material	Bio-Based Resin	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 Pro Trek PRG340-1 features a Bio-Based Resin case at 54.7 × 51.7 × 15.1mm with Mineral Glass protection. The Orient Sun & Moon offers Stainless Steel construction at 41.5mm with Mineral Glass. Both represent their brand's distinct design philosophy and heritage.

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Movement & Performance

Edge: Orient

Tough Solar (Solar Quartz) vs Automatic Caliber F6B24

The Pro Trek PRG340-1 runs the Tough Solar (Solar Quartz) (Tough Solar Quartz (No Battery Change), Tough Solar (Rechargeable) power reserve) at standard frequency. The Sun & Moon uses the Automatic Caliber F6B24 (Orient In-House Automatic (Hacking, Hand-Winding), 40 Hours reserve) at 21,600 vph (3 Hz). The Sun & Moon offers a longer power reserve.

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Wearability & Fit

Edge: Orient

54.7 × 51.7 × 15.1mm vs 41.5mm — different wrist presence

At 54.7 × 51.7 × 15.1mm, the Pro Trek PRG340-1 has a bolder wrist presence compared to the Sun & Moon at 41.5mm. Water resistance differs: 100m (10 ATM) vs 50m (5 ATM).

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Value & Cost of Ownership

Edge: Casio

Casio sits in the lower tier

The Casio Pro Trek PRG340-1 sits at $150–$250 and the Orient Sun & Moon at $250–$500. On the specs that outlast any price: the Pro Trek PRG340-1 uses Mineral Glass with Tough Solar (Rechargeable), against Mineral Glass and 40 Hours on the Sun & Moon. Service intervals are typically 5-7 years for both.

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Water Resistance

Edge: Casio

100m (10 ATM) vs 50m (5 ATM)

The Pro Trek PRG340-1 is rated to 100m (10 ATM) while the Sun & Moon handles 50m (5 ATM). The Pro Trek PRG340-1 is better suited for water activities.

Our Verdict

Casio

Pro Trek PRG340-1

Choose the Casio Pro Trek PRG340-1 if you prioritize Tough Solar Quartz (No Battery Change) engineering, Casio (Japan) craftsmanship, and 100m (10 ATM) water resistance. At $150–$250, it delivers Tough Solar (Solar Quartz) with Tough Solar (Rechargeable) power reserve.

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Orient

Sun & Moon

Choose the Orient Sun & Moon if you value Orient In-House Automatic (Hacking, Hand-Winding) technology, Made in Japan heritage, and 41.5mm proportions. At $250–$500, the Automatic Caliber F6B24 with 40 Hours power reserve makes it a compelling choice.

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The Bottom Line

The Casio Pro Trek PRG340-1 and Orient Sun & Moon 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 Sun & Moon is the better buy if you want a mechanical movement; the Casio Pro Trek PRG340-1 is the better buy if you want solar power and quartz accuracy with no servicing. For water, the Casio Pro Trek PRG340-1 is rated 100 m against 50 m, which is the difference between swimming and diving on one side and splashes on the other. On price, the Casio Pro Trek PRG340-1 sits a band lower ($150–$250 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 Pro Trek PRG340-1 offers better upfront value, sitting a tier lower at $150–$250. However, the Orient Sun & Moon may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The Pro Trek PRG340-1 at 54.7 × 51.7 × 15.1mm with 100m (10 ATM) water resistance handles everyday situations. The Sun & Moon at 41.5mm with 50m (5 ATM) is similarly capable. Both use 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.