Islander Automatic Diver #ISL-18vsSeiko King Turtle
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Automatic Diver #ISL-18

King Turtle
Diameter
43mm
45mm
Lug-to-Lug
46mm
lowest
47.7mm
Thickness
14mm
13.2mm
lowest
Water Resistance
200m
200m
Power Reserve
n/a
41h
MSRP
$369
lowest
$650
Movement
Seiko NH36
Seiko 4R36
Case
4 specsCrystal & Dial
3 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Islander Automatic Dive Watch #ISL-18 owners praise its 43mm size, double-domed sapphire crystal with anti-reflective coating, and embossed ceramic bezel. The watch is noted for its quality and weight at its $300 price point, featuring a Seiko NH36 automatic movement with hand-winding and hacking capabilities. On balance, owners rate the Islander Automatic Dive Watch #ISL-18 highly for its robust features and build quality at an accessible price.
Seiko King Turtle is widely praised for its excellent value and robust design, featuring the reliable 4R36 movement. Owners appreciate its superior lume and a bezel action described as smoother and more precise than some siblings. The 45mm cushion case, while substantial, wears smaller than expected due to its shape and short lug-to-lug distance. On balance, owners and reviewers rate the Seiko King Turtle highly for its proven design and overall value proposition.
The King Turtle's ceramic bezel and sapphire crystal are significant upgrades. Reviewers noted a slight price increase for these features.
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