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
ModerateCase covers 64% of your modeled wrist width.
Physical footprint
Clear spaceEstimated clearance: 7.1 mm per side.
Watch B
Visual presence
BoldCase covers 75% of your modeled wrist width.
Physical footprint
Clear spaceEstimated clearance: 5.3 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.
Start with the specifications that meaningfully differ. Expand the complete table for reference details and missing-data context.
| Specification | Glycine Combat Sub | Seiko 5 Sports GMT |
|---|---|---|
| Pricing | ||
| MSRP5 Sports GMT is $295 less at MSRP | $695 | $400 |
| New PriceCombat Sub is $121 less based on the current snapshot | $449 | $570 |
| Used Price (Low)Combat Sub is $47.3 less at the low end | $328 | $375 |
| Used Price (High) | $2,300 | $931 |
| 30-Day Trend | ↓ -16.8% | ↑ +3.4% |
| Used Price Range | $328 - $2,300 | $375 - $931 |
| Identity | ||
| Style | Diver, Tool, Sports | Sports, Tool |
| Dimensions | ||
| DiameterCombat Sub is 6.5mm smaller | 36mm | 42.5mm |
| Thickness | N/A | 13.6mm |
| Lug to Lug | 42.5mm | 46mm |
| Case | ||
| Crystal | Sapphire Crystal | Hardlex |
| Water ResistanceCombat Sub adds 100m water resistance | 200m (diving) | 100m (recreational diving) |
| Bezel | Unidirectional rotating | Bidirectional 24-hour |
2 fields are excluded from the differences view because one watch lacks comparable data. Use “All specs” to inspect those gaps.
This Glycine Combat Sub vs Seiko 5 Sports GMT comparison is less about a universal winner and more about wrist presence versus easier fit, water-ready utility versus dressier everyday wear, diver character versus sports versatility. Start with fit first — case width and lug-to-lug usually matter more than secondary features if wrist comfort is a concern.
Bottom line
Fit is a real separator here — compare case width and lug-to-lug before deciding, especially if wrist comfort matters more than headline features. Choose Glycine Combat Sub if you want a smaller case footprint on the wrist; choose Seiko 5 Sports GMT if you prefer more dial presence and a larger case feel.
Choose Glycine Combat Sub when
Glycine Combat Sub is a better fit for smaller wrists, mechanical-watch enthusiasts, diver styling.
Choose Seiko 5 Sports GMT when
Seiko 5 Sports GMT is a better fit for buyers who want more wrist presence, mechanical-watch enthusiasts, sports styling.
Movement and upkeep
Glycine Combat Sub: automatic movement
Seiko 5 Sports GMT: 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
Glycine Combat Sub: 36mm · L2L 42.5mm
Seiko 5 Sports GMT: 42.5mm · L2L 46mm · 161g
Fit is a real separator here — compare case width and lug-to-lug before deciding, especially if wrist comfort matters more than headline features.
Water resistance
Glycine Combat Sub: 200m
Seiko 5 Sports GMT: 100m
Water resistance is a meaningful separator here — the higher-rated option gives more flexibility for swimming or rougher daily use.
Price and value
Glycine Combat Sub: $449
Seiko 5 Sports GMT: $400
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
Glycine Combat Sub: diver
Seiko 5 Sports GMT: sports
Glycine Combat Sub leans more diver, while Seiko 5 Sports GMT pulls toward sports use case — pick the one that matches how you will actually wear it.
Crystal and materials
Glycine Combat Sub: sapphire crystal · steel
Seiko 5 Sports GMT: Hardlex 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.
Seiko 5 Sports GMT 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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Glycine Combat Sub
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Seiko 5 Sports GMT
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Glycine Combat Sub — it is 42.5mm lug-to-lug versus 46mm, and lug-to-lug is what decides whether a watch overhangs a smaller wrist.
Glycine Combat Sub — 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 $49 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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