Side by side

Tornek-Rayville CISO M38 FieldvsTimefactors Speedbird PRS-51

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

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.

Timefactors Speedbird PRS-51

Owners widely praise the Timefactors Speedbird PRS-51 for its flieger design, AR sapphire crystal, and value at £200. The 36mm case is noted to wear closer to 37mm due to the dial size, and while one owner describes the 5-link bracelet as well-built but stiff, another praises its drape and articulation. Accuracy figures vary among owners, with one reporting +7 seconds per day and another around +10 seconds per day, though one owner states theirs keeps impeccable time. The Miyota 9015 movement is noted by one owner to exhibit noticeable rotor wobble. Overall, owners rate the Timefactors Speedbird PRS-51 highly for its pilot watch aesthetics and value.

At a glance

11 of 29 specs differ
Diameter
CISO M38 Field38mm
Speedbird PRS-5136mm
Power Reserve
CISO M38 Field42h
Speedbird PRS-51
Water Resistance
CISO M38 Field100m
Speedbird PRS-51100m
MSRP
CISO M38 Field$695
Speedbird PRS-51$436

Full specifications

Case

5 specs
Category
Diameter
38mm
36mm
Thickness
12.45mm
11.4mm
Lug-to-Lug
43.6mm
42mm
Lug Width
20mm
18mm

Crystal & Dial

3 specs
AR Coating
Yes
Dial Color
Black
Lume
Superluminova
SuperLuminova X1-C3

Movement

2 specs
Caliber
Seiko NH36
Miyota 9015
Power Reserve
42h

Pricing

1 specs
MSRP
$695
$436
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