Side by side

Tornek-Rayville CISO M38 FieldvsSeiko 5 Sports SKX series

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

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What people say

Owners + reviewers, side by side

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

Tornek-Rayville CISO M38 Field

Owners widely report the Tornek-Rayville CISO M38 Field offers high overall quality with a comfortable bracelet featuring single-sided screw links. The watch exhibits minimal wear, with only hairline scratches and a faint, difficult-to-photograph bezel mark. On balance, owners value the Tornek-Rayville CISO M38 Field for its robust build and comfortable wearability.

Seiko 5 Sports SKX series

Owners widely praise the Seiko 5 Sports SKX series for its iconic dive watch design, robust build, and excellent value, with many appreciating its timeless styling and tool-like character. The movement, while basic, is noted as offering hacking and hand-winding capabilities, and accuracy varies, with many owners reporting +/-5 to 10 seconds per day despite the movement's potential for +/-40 seconds. Some owners find the original SKX models heavier and bulkier than newer iterations, while others critique the lack of a screw-down crown and ISO rating on the newer Seiko 5 Sports SKX series, deeming it less of a serious tool watch. Overall, owners rate the Seiko 5 Sports SKX series highly for its enduring design and value proposition as a robust, everyday watch.

At a glance

12 of 29 specs differ
Diameter
CISO M38 Field38mm
5 Sports SKX series28mm
Power Reserve
CISO M38 Field42h
5 Sports SKX series40h
Water Resistance
CISO M38 Field100m
5 Sports SKX series100m
MSRP
CISO M38 Field$695
5 Sports SKX series$315

Full specifications

Case

5 specs
Category
Sport
Diameter
38mm
28mm
Thickness
12.45mm
11.2mm
Lug-to-Lug
43.6mm
33.1mm
Lug Width
20mm
14mm

Crystal & Dial

3 specs
Crystal
Sapphire
Hardlex
AR Coating
Yes
Lume
Superluminova
LumiBrite on hands and index(es)

Movement

3 specs
Caliber
Seiko NH36
Seiko 2R06
Power Reserve
42h
40h
Jewels
0
21

Pricing

1 specs
MSRP
$695
$315
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