Side by side

Sheffield 1AvsSeiko Prospex Sea

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

1A
Sheffield1A
MSRP $223
Prospex Sea
SeikoProspex Sea
MSRP $625
What people say

Owners + reviewers, side by side

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

Sheffield 1A

Owners widely praise the Sheffield 1A for its superb quality, sturdiness, and value, with many finding its blue dial appealing and its construction more substantial than comparable models. One owner noted expensive shipping fees as a drawback, and another suggested the bezel action could be crisper. Overall, owners consider the Sheffield 1A a no-brainer for its affordability and quality.

Seiko Prospex Sea

The Seiko Prospex Sea is widely praised for its excellent value, solid build quality, and comfortable wearability, with many models featuring impressive lume and attractive dials. Owners and reviewers highlight the modern upgrades on classic designs, such as drilled lugs and reliable movements with hacking and hand-winding capabilities. Some models are noted for their refined case finishing and scratch resistance. Accuracy figures vary, with one owner reporting approximately 4 seconds fast per day, while others find the movements offer good performance for the price. Concerns raised by owners and reviewers include clasps that can feel generic or cheap, and lug widths that some find disproportionate to the case size on certain models. The thickness and weight of some Prospex Sea watches are also noted as substantial. The GMT function on specific models is considered secondary and difficult to read for true travel purposes.

At a glance

10 of 29 specs differ
Diameter
1A40mm
Prospex Sea43.8mm
Power Reserve
1A
Prospex Sea41h
Water Resistance
1A200m
Prospex Sea200m
MSRP
1A$223
Prospex Sea$625

Full specifications

Case

3 specs
Diameter
40mm
43.8mm
Lug-to-Lug
46mm
48.7mm
Lug Width
20mm
22mm

Crystal & Dial

3 specs
AR Coating
Inner
Anti-reflective coating on inner surface
Dial Color
White/Blue
Black
Lume
Swiss blue lume
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
NH35
Seiko 4R35
Power Reserve
41h
Jewels
25
23

Pricing

1 specs
MSRP
$223
$625
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