Sheffield 1A diver ~40mm 3-hand, Arabic numerals (12/3/6/9), no datevsSeiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition

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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.

Sheffield 1A diver ~40mm 3-hand, Arabic numerals (12/3/6/9), no date at true scale

1A diver ~40mm 3-hand, Arabic numerals (12/3/6/9), no date

Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition at true scale

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition

Diameter

40mm

42.7mm

Lug-to-Lug

46mm

lowest

46.4mm

Thickness

12.8mm

lowest

13.2mm

Water Resistance

200m

200m

Power Reserve

n/a

70h

MSRP

$238

lowest

$1,350

Movement

Seiko NH35

Seiko 6R35

Case

3 specs
Diameter
40mm
42.7mm
Thickness
12.8mm
13.2mm
Lug-to-Lug
46mm
46.4mm

Crystal & Dial

4 specs
Crystal Shape
n/a
Curved
AR Coating
n/a
Anti-reflective coating on inner surface
Dial Color
White/Blue
n/a
Lume
Swiss blue lume
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
Seiko NH35
Seiko 6R35
Power Reserve
n/a
70h
Jewels
0
24

Pricing

1 specs
MSRP
$238
$1,350
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Reviews

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

Sheffield 1A diver ~40mm 3-hand, Arabic numerals (12/3/6/9), no date

Owners widely praise the Sheffield 1A diver ~40mm 3-hand, Arabic numerals (12/3/6/9), no date for its superb quality, sturdiness, and exceptional value, particularly noting its blue dial and strong lume. One owner suggests the bezel action could be crisper. The watch features a 40mm steel case, sapphire crystal, and Seiko NH35 automatic movement. On balance, owners rate the Sheffield 1A diver ~40mm 3-hand, Arabic numerals (12/3/6/9), no date highly for its impressive build and features at an affordable price.

Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition

Owners widely praise the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition for its beautiful design and refinement over prior models, with its glacier-inspired textured dial being a particular highlight. However, a significant portion of the community finds the €1500 RRP to be too high, suggesting a price point closer to €900-€1000, and note the use of an aluminum bezel insert. Some owners report that the 6R movement runs slow. On balance, owners rate the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition highly for its aesthetic refinement, though the price point is a notable concern for the community.

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