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 76% of your modeled wrist width.
Physical footprint
Clear spaceEstimated clearance: 5.2 mm per side.
Watch B
Visual presence
BoldCase covers 77% of your modeled wrist width.
Physical footprint
Clear spaceEstimated clearance: 5.5 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 | Casio G-Shock |
|---|---|---|
| Pricing | ||
| New PriceG-Shock is $10 less based on the current snapshot | $120 | $110 |
| Used Price (Low)G-Shock is $15.4 less at the low end | $66 | $81 |
| Used Price (High) | $185 | $337 |
| 30-Day Trend | ↓ -6.2% | ↑ +13.1% |
| Used Price Range | $66 - $185 | $81 - $337 |
| Identity | ||
| Style | Ana-Digi, Sports, Tool | Digital, Sports, Tool |
| Dimensions | ||
| DiameterG-Shock is 0.9mm smaller | 42.9mm | 43.8mm |
| ThicknessG-Shock is 0.2mm thinner | 11.2mm | 11mm |
| WeightG-Shock is 1g lighter | 41g | 42g |
| Lug to Lug | 46.2mm | 45.7mm |
| Dial | ||
| LuminousG-Shock includes luminous markers | ✓ Included | Not included |
Casio G-Shock GMA-S2100 (small) and Casio G-Shock GMD-S5600 can look close on a spec sheet, yet the tradeoffs that matter most are usually ana-digi character versus digital versatility. They both touch the sports and tool use case, so smaller spec differences can matter more than brand preference.
Bottom line
These two often land in a similar price band — which usually means fit, features, and current deal quality matter more than the sticker price. Choose Casio G-Shock GMA-S2100 (small) if you are specifically shopping for a ana-digi style watch; choose Casio G-Shock GMD-S5600 if you are specifically shopping for a digital style watch.
Choose Casio G-Shock GMA-S2100 (small) when
Casio G-Shock GMA-S2100 (small) is a better fit for low-maintenance daily wear, ana-digi styling.
Choose Casio G-Shock GMD-S5600 when
Casio G-Shock GMD-S5600 is a better fit for low-maintenance daily wear, digital styling.
Movement and upkeep
Casio G-Shock GMA-S2100 (small): quartz movement
Casio G-Shock GMD-S5600: 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 GMA-S2100 (small): 42.9mm · L2L 46.2mm · 41g
Casio G-Shock GMD-S5600: 43.8mm · L2L 45.7mm · 42g
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 GMA-S2100 (small): 200m
Casio G-Shock GMD-S5600: 200m
Water resistance is similar on paper, so focus on fit, features, and price instead.
Price and value
Casio G-Shock GMA-S2100 (small): $120
Casio G-Shock GMD-S5600: $110
These two often land in a similar price band — which usually means fit, features, and current deal quality matter more than the sticker price.
Style and use case
Casio G-Shock GMA-S2100 (small): ana-digi
Casio G-Shock GMD-S5600: digital
Casio G-Shock GMA-S2100 (small) leans more ana-digi, while Casio G-Shock GMD-S5600 pulls toward digital use case — pick the one that matches how you will actually wear it.
Crystal and materials
Casio G-Shock GMA-S2100 (small): mineral crystal · resin
Casio G-Shock GMD-S5600: mineral crystal · resin
Materials are broadly similar, so finish, fit, and price will matter more than the materials list alone.
Casio G-Shock GMA-S2100 (small) and Casio G-Shock GMD-S5600 get compared constantly because both are sports/tool watches, they are within 0.9mm of each other in case width, they share the same quartz movement — so the spec sheet alone will not tell you which to buy.
Casio G-Shock GMD-S5600 for most buyers — Casio G-Shock GMA-S2100 (small) is around $120 and Casio G-Shock GMD-S5600 around $110 — about a $10 gap at typical listings.
Casio G-Shock GMD-S5600 usually offers the lower entry price — confirm current listings because marketplace pricing can move quickly.
These two often land in a similar price band — which usually means fit, features, and current deal quality matter more than the sticker price.
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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Casio G-Shock
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Neither is clearly smaller: case width is 42.9mm vs 43.8mm and thickness 11.2mm vs 11mm. Pick on strap and looks instead — the size difference is not what will decide this for you.
They are rated the same, so water resistance will not decide this. Choose on strap material and how much you mind scratching the case.
Casio G-Shock GMD-S5600 is the value pick at roughly $10 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.
Casio G-Shock GMA-S2100 (small) is around $120 and Casio G-Shock GMD-S5600 around $110 — about a $10 gap at typical listings. That is the difference you will notice day to day; the rest of the specs are close enough not to matter.
Casio G-Shock GMD-S5600 for most buyers — Casio G-Shock GMA-S2100 (small) is around $120 and Casio G-Shock GMD-S5600 around $110 — about a $10 gap at typical listings.
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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