Side-by-side comparison of specifications and features
Compare visual case presence and physical footprint on one shared wrist. Measure your top-down wrist width for a stronger result; lug-to-lug is used when the catalog has it.
Medium (6.7″)
Estimated top width: 56.7 mm
Preliminary range: 54.7–61.8 mm.
Watch A
Visual presence
BoldCase covers 71% of your modeled wrist width.
Physical footprint
Clear spaceEstimated clearance: 5.3 mm per side.
Watch B
Visual presence
BoldCase covers 71% of your modeled wrist width.
Physical footprint
Clear spaceEstimated clearance: 4.8 mm per side.
Proportional guide only: visual presence and physical footprint do not predict comfort. Weight, thickness, caseback shape, rigid lugs, strap stiffness, wrist-bone prominence, wearing tension, bezel design, and case curvature change how a watch actually wears. Non-round silhouettes use a verified family shape and catalog dimensions where available; missing case height or width is estimated from a conservative family aspect ratio.
Start with the specifications that meaningfully differ. Expand the complete table for reference details and missing-data context.
| Specification | Casio G-Shock | Tissot Seastar 1000 |
|---|---|---|
| Pricing | ||
| MSRPG-Shock is $275 less at MSRP | $200 | $475 |
| New PriceG-Shock is $274.5 less based on the current snapshot | $130 | $405 |
| Used Price (Low)G-Shock is $296 less at the low end | $90 | $386 |
| Used Price (High) | $650 | $590 |
| 30-Day Trend | ↓ -2.7% | ↑ +4.7% |
| Used Price Range | $90 - $650 | $386 - $590 |
| Identity | ||
| Style | Ana-Digi, Sports, Tool | Diver, Sports |
| Dimensions | ||
| DiameterSeastar 1000 is 0.4mm smaller | 40.4mm | 40mm |
| ThicknessG-Shock is 1.2mm thinner | 11mm | 12.2mm |
| WeightG-Shock is 79g lighter | 55g | 134g |
| Lug Width | 16mm | 20mm |
| Lug to Lug | 46mm | 47mm |
| Case | ||
| Crystal | Mineral Crystal | Sapphire Crystal |
| Water ResistanceSeastar 1000 adds 100m water resistance | 200m (diving) | 300m (diving) |
| Bezel | Fixed | Unidirectional rotating |
| Dial | ||
| Dial Color | Black | Blue |
This Casio G-Shock GM-S2100 (small metal) vs Tissot Seastar 1000 comparison is less about a universal winner and more about water-ready utility versus dressier everyday wear, ana-digi character versus diver versatility, entry price versus premium finishing or specs. Treat it as a value-versus-upgrade decision — confirm the extra spend solves a problem you will notice every week.
Bottom line
Water resistance is a meaningful separator here — the higher-rated option gives more flexibility for swimming or rougher daily use. Choose Casio G-Shock GM-S2100 (small metal) if you are specifically shopping for a ana-digi style watch; choose Tissot Seastar 1000 when swimming, beach use, or tougher daily wear is part of the plan.
Choose Casio G-Shock GM-S2100 (small metal) when
Casio G-Shock GM-S2100 (small metal) is a better fit for low-maintenance daily wear, ana-digi styling.
Choose Tissot Seastar 1000 when
Tissot Seastar 1000 is a better fit for low-maintenance daily wear, diver styling.
Movement and upkeep
Casio G-Shock GM-S2100 (small metal): quartz movement
Tissot Seastar 1000: quartz movement
Both use the same movement type, so maintenance differences are limited and fit or feature details should decide the purchase.
Size and wearability
Casio G-Shock GM-S2100 (small metal): 40.4mm · L2L 46mm · 55g
Tissot Seastar 1000: 40mm · L2L 47mm · 134g
Their size profiles are relatively close, so fit comes down to shape, weight, and how each watch sits on your wrist.
Water resistance
Casio G-Shock GM-S2100 (small metal): 200m
Tissot Seastar 1000: 300m
Water resistance is a meaningful separator here — the higher-rated option gives more flexibility for swimming or rougher daily use.
Price and value
Casio G-Shock GM-S2100 (small metal): $130
Tissot Seastar 1000: $405
There is a real price gap here — treat the more expensive option as an upgrade decision and confirm whether the extra spend buys something you will notice in weekly use.
Style and use case
Casio G-Shock GM-S2100 (small metal): ana-digi
Tissot Seastar 1000: diver
Casio G-Shock GM-S2100 (small metal) leans more ana-digi, while Tissot Seastar 1000 pulls toward diver use case — pick the one that matches how you will actually wear it.
Crystal and materials
Casio G-Shock GM-S2100 (small metal): mineral crystal · steel
Tissot Seastar 1000: sapphire crystal · steel
Crystal choice can change long-term wear expectations — one may prioritize scratch resistance while the other keeps cost or vintage feel in check.
Casio G-Shock GM-S2100 (small metal) is often the value play at current pricing, while Tissot Seastar 1000 makes more sense if you will use its extra features regularly.
There is a real price gap here — treat the more expensive option as an upgrade decision and confirm whether the extra spend buys something you will notice in weekly use.
Check current deals on Amazon and eBay using the buttons below — listing prices, seller quality, and condition can change quickly.
Prices change often, so compare the latest listings and condition options before you buy.
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Casio G-Shock
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Tissot Seastar 1000
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Casio G-Shock GM-S2100 (small metal) — it is 46mm lug-to-lug versus 47mm, and lug-to-lug is what decides whether a watch overhangs a smaller wrist.
Tissot Seastar 1000 — it is rated 300m versus 200m. Both are in the same broad bracket, so treat this as a tiebreaker rather than a deciding factor.
Casio G-Shock GM-S2100 (small metal) is the value pick at roughly $275 less. Pay more only if a specific difference above matters to you — otherwise the cheaper one is the smarter buy. Confirm live listings, since marketplace pricing moves.
Evidence & Method
This page currently relies on normalized catalog fields and calculated differences. No external reviewer observation is used in its verdict.
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