Side by side

Oris Great Barrier Reef Limited Edition IVvsSeiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition

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

At a glance

18 of 29 specs differ
Diameter
Great Barrier Reef Limited Edition IV43.5mm
Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition42.7mm
Power Reserve
Great Barrier Reef Limited Edition IV120 hoursh
Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition70h
Water Resistance
Great Barrier Reef Limited Edition IV300m
Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition200m
MSRP
Great Barrier Reef Limited Edition IV$4,750
Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition$1,350

Full specifications

Case

7 specs
Diameter
43.5mm
42.7mm
Thickness
13.2mm
Lug-to-Lug
46.4mm
Lug Width
23mm
20mm
Finish
Brushed and polished
Water Resistance
300m
200m
Caseback
Solid

Crystal & Dial

5 specs
Crystal Shape
Curved
AR Coating
Underside
Anti-reflective coating on inner surface
Dial Color
Blue
Black
Indices
Applied
Lume
None
LumiBrite on hands, index(es) and bezel

Movement

5 specs
Caliber
CALIBRE 400
6R35
Beat Rate
4 vph
28,800 vph
Power Reserve
120 hoursh
70h
Jewels
21
24
Complications
Date
None

Pricing

1 specs
MSRP
$4,750
$1,350

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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.

Oris Great Barrier Reef Limited Edition IV

The Oris Great Barrier Reef Limited Edition IV's 43.55mm case is surprisingly wearable on a 7-inch wrist due to its new design. Owners report the Oris Great Barrier Reef III, a 45mm watch, is massive and nearly 20mm thick. Overall, owners find the Oris Great Barrier Reef Limited Edition IV wearable despite its size, citing its new design as a key factor.

From video reviewers

The striking turquoise-to-navy gradient dial is a notable feature. The 43.5mm stainless steel case is noted for its ergonomic fit.

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

The Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition is praised for its beautiful design and refinement over previous models, featuring vertically textured glacier-inspired dials. Owners, however, consider the €1500 RRP too high, suggesting a price closer to €900-€1000, noting the aluminum bezel insert instead of ceramic. Some owners report the 6R movement runs slow. On balance, owners find the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition beautiful and a refinement, but the price and aluminum bezel are points of contention.

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