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 72% of your modeled wrist width.
Physical footprint
Clear spaceEstimated clearance: 5.1 mm per side.
Watch B
Visual presence
BoldCase covers 71% of your modeled wrist width.
Physical footprint
Clear spaceEstimated clearance: 5.1 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 | Halios Seaforth IV | Halios Seaforth |
|---|---|---|
| Pricing | ||
| New PriceSeaforth IV is $298 less based on the current snapshot | $999 | $1,297 |
| Used Price (Low)Seaforth IV is $27.9 less at the low end | $1,128 | $1,156 |
| Used Price (High) | $1,150 | $1,189 |
| 30-Day Trend | ↓ -5.2% | ↑ +14.6% |
| Used Price Range | $1,128 - $1,150 | $1,156 - $1,189 |
| Identity | ||
| Style | Diver, Vintage | Diver, Tool |
| Dimensions | ||
| DiameterSeaforth is 1mm smaller | 41mm | 40mm |
| Thickness | 12.4mm | N/A |
| Dial | ||
| Dial Color | Blue | Black/Blue |
1 field is excluded from the differences view because one watch lacks comparable data. Use “All specs” to inspect those gaps.
Halios Seaforth IV and Halios Seaforth can overlap on price or use case, but the buying decision usually comes down to fit, features, and current pricing. They both touch the diver use case, so smaller spec differences can matter more than brand preference.
Bottom line
Their size profiles are relatively close, so fit comes down to shape, weight, and how each watch sits on your wrist. Choose Halios Seaforth IV if you prefer how Halios Seaforth IV looks — on the specs we hold, nothing separates these two functionally; choose Halios Seaforth if you prefer how Halios Seaforth looks — on the specs we hold, nothing separates these two functionally.
Choose Halios Seaforth IV when
Halios Seaforth IV is a better fit for mechanical-watch enthusiasts, diver styling.
Choose Halios Seaforth when
Halios Seaforth is a better fit for mechanical-watch enthusiasts, diver styling.
Movement and upkeep
Halios Seaforth IV: automatic movement
Halios Seaforth: 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
Halios Seaforth IV: 41mm · L2L 46.5mm
Halios Seaforth: 40mm · L2L 46.5mm
Their size profiles are relatively close, so fit comes down to shape, weight, and how each watch sits on your wrist.
Water resistance
Halios Seaforth IV: 200m
Halios Seaforth: 200m
Water resistance is similar on paper, so focus on fit, features, and price instead.
Price and value
Halios Seaforth IV: $765
Halios Seaforth: $765
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
Halios Seaforth IV: diver
Halios Seaforth: diver
Both lean into a similar diver use case — the choice is more about fit, features, and price than category.
Crystal and materials
Halios Seaforth IV: sapphire crystal · steel
Halios Seaforth: sapphire crystal · steel
Materials are broadly similar, so finish, fit, and price will matter more than the materials list alone.
Halios Seaforth IV and Halios Seaforth get compared constantly because both are diver watches, they are within 1mm of each other in case width, they share the same automatic movement — so the spec sheet alone will not tell you which to buy.
Halios Seaforth IV 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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Halios Seaforth IV
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Halios Seaforth
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Neither is clearly smaller: case width is 41mm vs 40mm. 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.
On the specifications we hold they are near-identical. Choose on looks and current price — there is no functional reason to prefer one.
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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