Seiko 5KXvsThorn 40mm PT5000 Automatic Dive Watch T023 V3.1 – Upgraded Bracelet Edition

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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 40mm PT5000 Automatic Dive Watch T023 V3.1 – Upgraded Bracelet Edition at true scale

40mm PT5000 Automatic Dive Watch T023 V3.1 – Upgraded Bracelet Edition

Diameter

42.5mm

40mm

Lug-to-Lug

46mm

lowest

46.6mm

Thickness

13.4mm

12.3mm

lowest

Water Resistance

100m

200m

highest

Power Reserve

41h

n/a

MSRP

$350

$199

lowest

Movement

Seiko 4R36

PT5000

Case

5 specs
Diameter
42.5mm
40mm
Thickness
13.4mm
12.3mm
Lug-to-Lug
46mm
46.6mm
Lug Width
22mm
20mm
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
PT5000
Power Reserve
41h
0h
Jewels
24
0

Pricing

1 specs
MSRP
$350
$199
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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 40mm PT5000 Automatic Dive Watch T023 V3.1 – Upgraded Bracelet Edition

Owners widely praise the Thorn 40mm PT5000 Automatic Dive Watch T023 V3.1 – Upgraded Bracelet Edition for its desirable vintage feel, spot-on proportions, and classic case and dial design, with one owner calling it the best vintage diver homage. The PT5000 movement is noted for its accuracy, with one report of 0/+2 seconds per day, and is described as smooth. The upgraded bracelet is a favorite for many, though some find its riveted construction difficult to adjust and one owner considers its quality lesser compared to another model. On balance, owners rate the Thorn 40mm PT5000 Automatic Dive Watch T023 V3.1 – Upgraded Bracelet Edition highly for its vintage aesthetic and smooth movement at its price point.

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