Smiths BABY Speedbird PRS-51vsSeiko Seiko 5 Sports Field series

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Measurements

Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Smiths BABY Speedbird PRS-51 at true scale

BABY Speedbird PRS-51

Seiko Seiko 5 Sports Field series at true scale

Seiko 5 Sports Field series

Diameter

36mm

39.4mm

Lug-to-Lug

42mm

lowest

48.1mm

Thickness

11.4mm

lowest

13.2mm

Water Resistance

100m

100m

Power Reserve

n/a

41h

MSRP

n/a

$315

Movement

Miyota 9015

Seiko 4R36

Case

4 specs
Diameter
36mm
39.4mm
Thickness
11.4mm
13.2mm
Lug-to-Lug
42mm
48.1mm
Lug Width
18mm
20mm

Crystal & Dial

3 specs
Crystal
Sapphire
Hardlex
Crystal Shape
n/a
Curved
Lume
SuperLuminova
LumiBrite on hands and index(es)

Movement

3 specs
Caliber
Miyota 9015
Seiko 4R36
Power Reserve
n/a
41h
Jewels
0
24

Pricing

1 specs
MSRP
n/a
$315
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Reviews

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Smiths BABY Speedbird PRS-51

Smiths BABY SPEEDBIRD PRS-51 owners widely praise its high-quality finishing above its price point and its comfortable, flat wearability on the wrist. The minimalistic dial with a subtle date window at 6 o'clock is noted for legibility. Some owners report accuracy figures of +7 to +10 seconds per day with the Miyota 9015 movement, which they find acceptable given the cost. The 5-link bracelet is described as stiff and heavy, leading some to prefer alternatives like NATO or leather straps, and one owner noted noticeable rotor wobble. On balance, owners rate the Smiths BABY SPEEDBIRD PRS-51 highly for its excellent finishing and comfortable wearability at its price point.

Seiko 5 Sports Field series

The Seiko 5 Sports Field series is praised for its excellent legibility, featuring fully lumed Arabic numerals and a lumed pearl on the compass bezel. Reviewers note the reliable 4R36 movement and 10 bar water resistance, with some considering the watches good value under 500 euros. The GMT variants, specifically the SSK023 and SSK025, offer an accessible explorer watch with a GMT complication and a fixed 24-hour bezel. Overall, owners and reviewers rate the Seiko 5 Sports Field series highly for its legibility and value proposition.