Side by side

Spinnaker Dumas AutomaticvsTimefactors 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.

Spinnaker Dumas Automatic

Owners widely praise the Spinnaker Dumas Automatic for its attractive textured blue dial, applied indices, and well-finished case, noting its comfortable wearability due to a short lug-to-lug distance. Some owners flag the use of mineral crystal instead of sapphire and a bracelet with a learning curve and loose keeper. Overall, owners rate the Spinnaker Dumas Automatic highly for its aesthetics and case finishing at its 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

12 of 29 specs differ
Diameter
Dumas Automatic44mm
Speedbird PRS-5136mm
Power Reserve
Dumas Automatic
Speedbird PRS-51
Water Resistance
Dumas Automatic300m
Speedbird PRS-51100m
MSRP
Dumas Automatic$239
Speedbird PRS-51$436

Full specifications

Case

7 specs
Category
Diver
Diameter
44mm
36mm
Thickness
15mm
11.4mm
Lug-to-Lug
48mm
42mm
Lug Width
22mm
18mm
Material
316L Stainless Steel
Stainless Steel
Water Resistance
300m
100m

Crystal & Dial

2 specs
Dial Color
Blue
Black
Lume
None
SuperLuminova X1-C3

Movement

2 specs
Caliber
Seiko NH35
Miyota 9015
Power Reserve
0h

Pricing

1 specs
MSRP
$239
$436
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