Halios Seaforth IV vs Halios Seaforth

Movement and upkeep

Both use the same movement type, so maintenance differences are limited and fit or feature details should decide the purchase.

Size and wearability

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

Water resistance is similar on paper, so focus on fit, features, and price instead.

Price and value

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

Both lean into a similar diver use case — the choice is more about fit, features, and price than category.

Crystal and materials

Materials are broadly similar, so finish, fit, and price will matter more than the materials list alone.