Side by side

Tornek-Rayville CISO M38 FieldvsSeiko Prospex SPEEDTIMER Mechanical

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

CISO M38 Field
Tornek-RayvilleCISO M38 Field
MSRP $695
Prospex SPEEDTIMER Mechanical
SeikoProspex SPEEDTIMER Mechanical
MSRP $995

At a glance

12 of 29 specs differ
Diameter
CISO M38 Field38mm
Prospex SPEEDTIMER Mechanical39.5mm
Power Reserve
CISO M38 Field42h
Prospex SPEEDTIMER Mechanical72h
Water Resistance
CISO M38 Field100m
Prospex SPEEDTIMER Mechanical200m
MSRP
CISO M38 Field$695
Prospex SPEEDTIMER Mechanical$995

Full specifications

Case

5 specs
Category
Chronograph
Diameter
38mm
39.5mm
Thickness
12.45mm
12mm
Lug-to-Lug
43.6mm
44.5mm
Water Resistance
100m
200m

Crystal & Dial

3 specs
Crystal Shape
Flat
Curved
AR Coating
Yes
Anti-reflective coating on inner surface
Lume
Superluminova
LumiBrite on hands and index(es)

Movement

3 specs
Caliber
TMI NH36
6R55
Power Reserve
42h
72h
Jewels
25
24

Pricing

1 specs
MSRP
$695
$995

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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 Prospex SPEEDTIMER Mechanical

The Seiko Prospex SPEEDTIMER Mechanical is praised for its visually appealing design and comfortable wearability, with owners frequently using its chronograph function for daily tasks. Reviewers note its clean dial layout and LumiBrite treated hands and markers, and one source highlights the 72-hour power reserve of the 6R55 movement. However, some owners criticize its chronograph functionality and the 24-hour subdial. On balance, owners and reviewers rate the Seiko Prospex SPEEDTIMER Mechanical highly for its daily usability and refined aesthetics.

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