Side by side

MKII HellionvsTimefactors Speedbird PRS-51

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.

MKII Hellion

The MKII Hellion is widely praised for its immaculate fit and finish, with a mirror-polished case that bridges field and dress styles. Owners appreciate its vintage-inspired lug design and the satisfying heft that balances classic appeal. The large crown is a noted feature, adding a masculine touch to the refined design. One owner questions if the price aligns with the specifications. Overall, owners rate the MKII Hellion highly for its exceptional finishing and versatile, refined design at the price point.

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

7 of 29 specs differ
Diameter
Hellion39mm
Speedbird PRS-5136mm
Power Reserve
Hellion
Speedbird PRS-51
Water Resistance
Hellion100m
Speedbird PRS-51100m
MSRP
Hellion$649
Speedbird PRS-51$436

Full specifications

Case

4 specs
Diameter
39mm
36mm
Thickness
13.55mm
11.4mm
Lug-to-Lug
48.5mm
42mm
Lug Width
20mm
18mm

Crystal & Dial

1 specs
Lume
SuperLuminova
SuperLuminova X1-C3

Movement

1 specs
Caliber
Seiko NH38
Miyota 9015

Pricing

1 specs
MSRP
$649
$436
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