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.

Seiko 5KX at true scale

5KX

Thorn Marine 200 Master Diver at true scale

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 specs
Diameter
42.5mm
42mm
Thickness
13.4mm
12.45mm
Lug-to-Lug
46mm
48.5mm
Lug Width
22mm
20mm
Material
Stainless Steel
316L stainless steel
Water Resistance
100m
200m

Crystal & Dial

3 specs
Crystal
Hardlex
Sapphire
Dial Color
Blue
n/a
Lume
LumiBrite on hands and index(es)
None

Movement

3 specs
Caliber
Seiko 4R36
Seiko NH35
Power Reserve
41h
0h
Jewels
24
0

Pricing

1 specs
MSRP
$350
$179
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Reviews

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

Seiko 5KX

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.

Thorn Marine 200 Master Diver

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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