Side by side

Islander Islander 38mm Automatic Dive Watch with Radiant Blue Dial #ISL-63vsSeiko Prospex Sea

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

The bottom line

The 38mm Islander 38mm Automatic Dive Watch with Radiant Blue Dial #ISL-63 wears 3.7mm narrower than the 41.7mm Prospex Sea — that's a meaningful jump on most wrists.

What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Islander 38mm Automatic Dive Watch with Radiant Blue Dial #ISL-63

The Islander 38mm Automatic Dive Watch with Radiant Blue Dial #ISL-63 is praised for its screw pins, milled scissor clasp, and embossed ceramic bezel, offering excellent specifications for its price. Owners note its better alignment compared to some alternatives and appreciate its design inspiration. Overall, owners rate the Islander 38mm Automatic Dive Watch with Radiant Blue Dial #ISL-63 highly for its build features and value.

Seiko Prospex Sea

Owners and reviewers widely praise the Seiko Prospex Sea for its excellent value, robust build, and superior lume, with many noting its comfortable wearability and faithful design recreations. Some owners report the watch can feel big, thick, and heavy on smaller wrists, while others find the sizing perfect. The bezel action is frequently highlighted as smooth and precise, often exceeding that of less expensive models. On balance, owners and reviewers rate the Seiko Prospex Sea highly for its impressive finishing and value proposition.

Where to get them

Check prices & track

Islander 38mm Automatic Dive Watch with Radiant Blue Dial #ISL-63
Islander 38mm Automatic Dive Watch with Radiant Blue Dial #ISL-63
MSRP $429
Seiko Prospex Sea
Seiko Prospex Sea
MSRP $595
Islander 38mm Automatic Dive Watch with Radiant Blue Dial #ISL-63
IslanderIslander 38mm Automatic Dive Watch with Radiant Blue Dial #ISL-63
MSRP $429
Prospex Sea
SeikoProspex Sea
MSRP $595

At a glance

16 of 29 specs differ
Diameter
Islander 38mm Automatic Dive Watch with Radiant Blue Dial #ISL-6338mm
Prospex Sea41.7mm
Power Reserve
Islander 38mm Automatic Dive Watch with Radiant Blue Dial #ISL-63
Prospex Sea41h
Water Resistance
Islander 38mm Automatic Dive Watch with Radiant Blue Dial #ISL-63200m
Prospex Sea200m
MSRP
Islander 38mm Automatic Dive Watch with Radiant Blue Dial #ISL-63$429
Prospex Sea$595

Full specifications

Case

5 specs
Diameter
38mm
41.7mm
Thickness
13mm
12.3mm
Lug-to-Lug
44.5mm
49.5mm
Finish
Brushed and polished
Caseback
Engraved screw-in back
Solid

Crystal & Dial

6 specs
Crystal
Sapphire
Hardlex
Crystal Shape
Double Domed
Flat
AR Coating
Yes
Inner
Dial Color
Black
Indices
Applied
Lume
None
LumiBrite on hands, index(es) and bezel

Movement

4 specs
Caliber
Seiko NH36
4R35
Beat Rate
0 vph
28,800 vph
Power Reserve
0h
41h
Jewels
0
23

Pricing

1 specs
MSRP
$429
$595

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