Sheffield 1A 40mmvsSeiko Prospex Sea

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Sheffield 1A 40mm

MSRP $228

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Buy from Sheffield Used on eBay

Seiko Prospex Sea

MSRP $900

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Buy from Seiko Used on eBay

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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.

1A 40mm

Prospex Sea

Diameter

Across the case, crown excluded.

40mm

41mm

Lug-to-Lug

The number that decides fit.

48mm

46.9mm

lowest

Thickness

How it sits under a cuff.

13mm

12.3mm

lowest

Water Resistance

Rated in meters.

200m

Power Reserve

How long it runs off the wrist.

n/a

70h

MSRP

Sticker price, new.

$228

lowest

$900

Movement

What drives the hands.

Seiko NH35

Seiko 6R35

Spec

1A 40mm

Prospex Sea

Case

3 specs

Diameter

40mm

41mm

Thickness

13mm

12.3mm

Lug-to-Lug

48mm

46.9mm

Crystal & Dial

4 specs

Crystal Shape

n/a

Curved

AR Coating

n/a

Anti-reflective coating on inner surface

Dial Color

n/a

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

Seiko NH35

Seiko 6R35

Power Reserve

70h

Jewels

Pricing

1 specs

MSRP

$228

$900

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Reviews

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

Sheffield 1A 40mm

Owners widely praise the Sheffield 1A 40mm for its superb quality, sturdiness, and amazing price, with particular appreciation for its blue dial and strong lume. The watch features a 40mm steel case and a sapphire crystal. One owner notes the bezel action could be crisper. On balance, owners rate the Sheffield 1A 40mm highly for its exceptional value and build quality at the price point.

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WatchUSeek

Seiko Prospex Sea

Owners widely praise the Seiko Prospex Sea for its value and robust build, with many highlighting its excellent lume and attractive design. Some owners find the 41mm case size perfect, while others with smaller wrists consider it too large, thick, and heavy. The stock rubber strap is noted as uncomfortable for land wear by one owner. Overall, owners rate the Seiko Prospex Sea highly for its design and value at the price point.