Seiko 5KXvsTuseno Blackwater

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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

Tuseno Blackwater at true scale

Blackwater

Diameter

42.5mm

40.5mm

Lug-to-Lug

46mm

lowest

50mm

Thickness

13.4mm

n/a

Water Resistance

100m

200m

highest

Power Reserve

41h

n/a

MSRP

$350

lowest

$999

Movement

Seiko 4R36

Sellita SW200-1

Case

5 specs
Diameter
42.5mm
40.5mm
Thickness
13.4mm
n/a
Lug-to-Lug
46mm
50mm
Lug Width
22mm
n/a
Water Resistance
100m
200m

Crystal & Dial

3 specs
Crystal
Hardlex
Sapphire
Dial Color
Blue
Black
Lume
LumiBrite on hands and index(es)
BGW9 Swiss Super-LumiNova

Movement

3 specs
Caliber
Seiko 4R36
Sellita SW200-1
Power Reserve
41h
n/a
Jewels
24
0

Pricing

1 specs
MSRP
$350
$999
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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.

Tuseno Blackwater

The Tuseno Blackwater is praised by owners and reviewers for its attractive, non-ordinary diver styling and versatile design. Enthusiastic owners state it "slaps hard," and reviewers highlight its value proposition at its price point, durability, and compelling wrist presence. The integrated bracelet is a standout feature, offering fluidity. The Tuseno Blackwater features a Sellita SW200-1 automatic movement, 200m water resistance, and a 40.5mm case. Some reviewers note a 38-hour power reserve as a bit lacking, while others find the bezel action solid but potentially stiff. On balance, owners and reviewers rate the Tuseno Blackwater highly for its unique styling and value at the price.