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 75% of your modeled wrist width.
Physical footprint
Clear spaceEstimated clearance: 5.3 mm per side.
Watch B
Visual presence
BoldCase covers 78% of your modeled wrist width.
Physical footprint
Clear spaceEstimated clearance: 4.3 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 | Seiko 5 Sports GMT | Seiko Prospex Turtle |
|---|---|---|
| Pricing | ||
| MSRP5 Sports GMT is $225 less at MSRP | $400 | $625 |
| New Price5 Sports GMT is $270.6 less based on the current snapshot | $570 | $841 |
| Used Price (Low)5 Sports GMT is $43.3 less at the low end | $353 | $397 |
| Used Price (High) | $931 | $1,323 |
| 30-Day Trend | ↓ -34.0% | ↓ -19.1% |
| Used Price Range | $353 - $931 | $397 - $1,323 |
| Identity | ||
| Style | Sports, Tool | Diver, Tool |
| Dimensions | ||
| Diameter5 Sports GMT is 1.8mm smaller | 42.5mm | 44.3mm |
| ThicknessProspex Turtle is 0.2mm thinner | 13.6mm | 13.4mm |
| Lug to Lug | 46mm | 48mm |
| Case | ||
| Water ResistanceProspex Turtle adds 100m water resistance | 100m (recreational diving) | 200m (diving) |
| Bezel | Bidirectional 24-hour | Unidirectional rotating |
1 field is excluded from the differences view because one watch lacks comparable data. Use “All specs” to inspect those gaps.
This Seiko 5 Sports GMT vs Seiko Prospex Turtle comparison is less about a universal winner and more about water-ready utility versus dressier everyday wear, sports 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
Seiko Prospex Turtle is the better tool watch for water use because its 200m dive rating and purpose-built case matter more than an extra time-zone hand. Choose Seiko 5 Sports GMT when travel utility, a steel bracelet, and tracking a second time zone are more useful than dive capability.
Choose Seiko 5 Sports GMT when
Seiko 5 Sports GMT is a better fit for smaller wrists, mechanical-watch enthusiasts, sports styling.
Choose Seiko Prospex Turtle when
Seiko Prospex Turtle is a better fit for buyers who want more wrist presence, mechanical-watch enthusiasts, diver styling.
Movement and upkeep
Seiko 5 Sports GMT: automatic movement
Seiko Prospex Turtle: automatic movement
Both use the same movement type, so maintenance differences are limited and fit or feature details should decide the purchase.
Size and wearability
Seiko 5 Sports GMT: 42.5mm · L2L 46mm · 161g
Seiko Prospex Turtle: 44.3mm · L2L 48mm
Their size profiles are relatively close, so fit comes down to shape, weight, and how each watch sits on your wrist.
Water resistance
Seiko 5 Sports GMT: 100m
Seiko Prospex Turtle: 200m
Water resistance is a meaningful separator here — the higher-rated option gives more flexibility for swimming or rougher daily use.
Price and value
Seiko 5 Sports GMT: $400
Seiko Prospex Turtle: $625
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
Seiko 5 Sports GMT: sports
Seiko Prospex Turtle: diver
Seiko 5 Sports GMT leans more sports, while Seiko Prospex Turtle pulls toward diver use case — pick the one that matches how you will actually wear it.
Crystal and materials
Seiko 5 Sports GMT: Hardlex crystal · steel
Seiko Prospex Turtle: Hardlex crystal · steel
Materials are broadly similar, so finish, fit, and price will matter more than the materials list alone.
Seiko 5 Sports GMT is often the value play at current pricing, while Seiko Prospex Turtle 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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Seiko 5 Sports GMT
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Seiko Prospex Turtle
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Seiko 5 Sports GMT — it is 46mm lug-to-lug versus 48mm, and lug-to-lug is what decides whether a watch overhangs a smaller wrist.
Seiko Prospex Turtle — it is rated 200m versus 100m. Both are in the same broad bracket, so treat this as a tiebreaker rather than a deciding factor.
Seiko 5 Sports GMT is the value pick at roughly $225 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
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