Head-to-Head Comparison

Updated September 5, 2026

Casio G-Shock GA-B2100 CasiOak vs Timex Weekender Chronograph

Casio's diver meets Timex's chronograph

Quick Verdict

The Timex Weekender Chronograph ($50–$100) delivers Quartz Chronograph (Battery) technology in the tier below the Casio G-Shock GA-B2100 CasiOak ($100–$150). The Weekender Chronograph measures 40mm and is rated 30m (3 ATM). The G-Shock GA-B2100 CasiOak justifies its premium with Made in Japan heritage and Quartz Module 5689 (Tough Solar + Bluetooth). Both represent excellent choices in the luxury watch category.

CasioG-Shock GA-B2100 CasiOak$100–$150 Check price View the dossier

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Casio

G-Shock GA-B2100 CasiOak

$100–$150

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Timex

Weekender Chronograph

$50–$100

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Specifications Compared

Feature	Casio G-Shock GA-B2100 CasiOak	Timex Weekender Chronograph
Price	$100–$150	$50–$100
Case Size	45.4mm (48.5mm lug-to-lug, 11.9mm thick)	40mm
Movement	Quartz Module 5689 (Tough Solar + Bluetooth)	Quartz Chronograph
Caliber Type	Casio Quartz (Solar-Powered)	Quartz Chronograph (Battery)
Power Reserve	About 7 months on a full charge without light; about 18 months in power-saving (Casio)	Battery
Water Resistance	200m (20 ATM)	30m (3 ATM)
Crystal	Mineral Glass	Mineral Glass
Case Material	Carbon Core Guard Resin	Brass (Silver-Tone)
Origin	Made in Japan	Timex (USA Design)

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Casio's design language vs Timex's approach

The Casio G-Shock GA-B2100 CasiOak features a Carbon Core Guard Resin case at 45.4mm (48.5mm lug-to-lug, 11.9mm thick) with Mineral Glass protection. The Timex Weekender Chronograph offers Brass (Silver-Tone) construction at 40mm with Mineral Glass. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Casio

Quartz Module 5689 (Tough Solar + Bluetooth) vs Quartz Chronograph

The G-Shock GA-B2100 CasiOak runs the Quartz Module 5689 (Tough Solar + Bluetooth) (Casio Quartz (Solar-Powered), About 7 months on a full charge without light; about 18 months in power-saving (Casio) power reserve) at standard frequency. The Weekender Chronograph uses the Quartz Chronograph (Quartz Chronograph (Battery), Battery reserve) at standard. The G-Shock GA-B2100 CasiOak edges ahead on power reserve.

📏

Wearability & Fit

Edge: Timex

45.4mm (48.5mm lug-to-lug, 11.9mm thick) vs 40mm — different wrist presence

At 45.4mm (48.5mm lug-to-lug, 11.9mm thick), the G-Shock GA-B2100 CasiOak has a bolder wrist presence compared to the Weekender Chronograph at 40mm. Water resistance differs: 200m (20 ATM) vs 30m (3 ATM).

💰

Value & Cost of Ownership

Edge: Timex

Timex sits in the lower tier

The Casio G-Shock GA-B2100 CasiOak sits at $100–$150 and the Timex Weekender Chronograph at $50–$100. On the specs that outlast any price: the G-Shock GA-B2100 CasiOak uses Mineral Glass with About 7 months on a full charge without light; about 18 months in power-saving (Casio), against Mineral Glass and Battery on the Weekender Chronograph. Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Casio

200m (20 ATM) vs 30m (3 ATM)

The G-Shock GA-B2100 CasiOak is rated to 200m (20 ATM) while the Weekender Chronograph handles 30m (3 ATM). The G-Shock GA-B2100 CasiOak is better suited for water activities.

Our Verdict

Casio

G-Shock GA-B2100 CasiOak

Choose the Casio G-Shock GA-B2100 CasiOak if you prioritize Casio Quartz (Solar-Powered) engineering, Made in Japan craftsmanship, and 200m (20 ATM) water resistance. At $100–$150, it delivers Quartz Module 5689 (Tough Solar + Bluetooth) with About 7 months on a full charge without light; about 18 months in power-saving (Casio) power reserve.

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Timex

Weekender Chronograph

Choose the Timex Weekender Chronograph if you value Quartz Chronograph (Battery) technology, Timex (USA Design) heritage, and 40mm proportions. At $50–$100, the Quartz Chronograph with Battery power reserve makes it a compelling choice.

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The Bottom Line

The Casio G-Shock GA-B2100 CasiOak and Timex Weekender Chronograph represent two distinct approaches to fine watchmaking — the Casio bringing Made in Japan tradition while Timex delivers Timex (USA Design) engineering.

Frequently Asked Questions

For water, the Casio G-Shock GA-B2100 CasiOak is rated 200 m against 30 m, which is the difference between swimming and diving on one side and splashes on the other. On price, the Timex Weekender Chronograph sits a band lower ($50–$100 against $100–$150), 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 Timex Weekender Chronograph offers better upfront value, sitting a tier lower at $50–$100. However, the Casio G-Shock GA-B2100 CasiOak may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The G-Shock GA-B2100 CasiOak at 45.4mm (48.5mm lug-to-lug, 11.9mm thick) with 200m (20 ATM) water resistance handles everyday situations. The Weekender Chronograph at 40mm with 30m (3 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.