Seiko 5KXvsThorn Marine 200 Master Diver

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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.

5KX

Marine 200 Master Diver
Diameter
42.5mm
42mm
Lug-to-Lug
46mm
lowest
48.5mm
Thickness
13.4mm
12.4mm
lowest
Water Resistance
100m
200m
highest
Power Reserve
41h
n/a
MSRP
$350
$179
lowest
Movement
Seiko 4R36
Seiko NH35
Case
6 specsCrystal & Dial
3 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Seiko 5KX for its strong lume and value, with many reporting accuracy within +/-5 to 10 seconds per day, though some experience +/-1 second. The 42.5mm case is noted to wear smaller, and the watch offers a comfortable feel for many. Some owners are split on the bracelet quality, with opinions ranging from "cheaper side" with hollow links to "flimsy-feeling" jubilee. A few quality control issues have been reported, including a failed bezel clickspring and misaligned components. The Seiko 5KX is seen by some as a worthy successor to the original SKX, offering an upgraded movement with hacking and hand-winding capabilities, though others lament the loss of ISO certification and a screw-down crown. Overall, owners rate the Seiko 5KX highly for its excellent lume and value proposition, making it a popular choice for everyday wear.
Owners widely praise the Thorn Marine 200 Master Diver Watch for its 200m water resistance and screw-down crown, making it suitable for swimming and diving. The bracelet on this Pelagos-style model is considered excellent, and one owner finds the watch comfortable and a good value for daily wear at $131. However, some find the lume only okay and the bezel a bit stiff, while another owner notes the Thorn text on the dial is unnecessary clutter. On balance, owners rate the Thorn Marine 200 Master Diver Watch highly for its robust water resistance and comfortable, well-received bracelet at its price point.
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