Side by side

Seiko 5 Sports Field seriesvsTimefactors Speedbird GMT

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.

Seiko 5 Sports Field series

The Seiko 5 Sports Field series is praised for its value, offering an accessible explorer-style watch with a GMT complication and excellent legibility thanks to LumiBrite on the dial and bezel. The watches feature a 41mm stainless steel case, 100m water resistance, and are powered by either the 4R36 or 4R34 movement, both with a 41-hour power reserve. One reviewer notes the inclusion of a compass bezel with a lumed pearl and fully lumed Arabic numerals on the dial for the non-GMT models. Overall, reviewers consider the Seiko 5 Sports Field GMT models good value under 500 euros.

Timefactors Speedbird GMT

Owners widely praise the Timefactors Speedbird GMT for its quality and value, with many appreciating its 36mm case size for wearability and its surprisingly good bracelet. Some owners note the GMT function is on an inner ring, and one owner found the date wheel sunken. The watch is noted for its classic aesthetic and is considered a good value, though purchasing requires patience due to limited order windows. Overall, owners rate the Timefactors Speedbird GMT highly for its wearability and value at the price point.

At a glance

13 of 29 specs differ
Diameter
5 Sports Field series39.4mm
Speedbird GMT36mm
Power Reserve
5 Sports Field series41h
Speedbird GMT
Water Resistance
5 Sports Field series100m
Speedbird GMT100m
MSRP
5 Sports Field series$315
Speedbird GMT$315

Full specifications

Case

5 specs
Category
Sport
Diameter
39.4mm
36mm
Thickness
13.2mm
11.6mm
Lug-to-Lug
48.1mm
42.5mm
Lug Width
20mm
18mm

Crystal & Dial

4 specs
Crystal
Hardlex
Sapphire
Crystal Shape
Curved
Dial Color
Black
Lume
LumiBrite on hands and index(es)
Super Luminova X1 C3

Movement

4 specs
Caliber
Seiko 4R36
Ronda 515
Type
Automatic
Quartz
Power Reserve
41h
Jewels
24
0
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