Which is cheaper, the Marathon OSAR-D (Original SAR with Date) Automatic 41mm or the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

At MSRP the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition is the cheaper of the two at $1,350, against $1,800 for the Marathon OSAR-D (Original SAR with Date) Automatic 41mm — a $450 gap before any retailer discounting.

Which is bigger, the Marathon OSAR-D (Original SAR with Date) Automatic 41mm or the 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 wears larger at 42.7mm versus 41mm for the Marathon OSAR-D (Original SAR with Date) Automatic 41mm — a 1.7mm difference across the dial.

Which has better water resistance, the Marathon OSAR-D (Original SAR with Date) Automatic 41mm or the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

The Marathon OSAR-D (Original SAR with Date) Automatic 41mm is rated to 300m versus 200m for the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition.

Which has a longer power reserve, the Marathon OSAR-D (Original SAR with Date) Automatic 41mm or the 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 carries a 70-hour power reserve against 40 hours on the Marathon OSAR-D (Original SAR with Date) Automatic 41mm.

What movement does the Marathon OSAR-D (Original SAR with Date) Automatic 41mm run compared to the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition?

Both watches run automatic movements — the Marathon OSAR-D (Original SAR with Date) Automatic 41mm uses the Sellita SW220-1 and the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition uses the 6R35.

Side by side

Marathon OSAR-D (Original SAR with Date) Automatic 41mmvsSeiko 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.

Marathon OSAR-D (Original SAR with Date) Automatic 41mm

41mm-original-sar-w-date-osar-d

MSRP $1,800

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

spb301j1

MSRP $1,350

At a glance

13 of 29 specs differ

Diameter

OSAR-D (Original SAR with Date) Automatic 41mm41mm

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition42.7mm

Power Reserve

OSAR-D (Original SAR with Date) Automatic 41mm40h

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition70h

Water Resistance

OSAR-D (Original SAR with Date) Automatic 41mm300m

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition200m

MSRP

OSAR-D (Original SAR with Date) Automatic 41mm$1,800

Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition$1,350

Full specifications

Case

6 specs

Diameter

41mm

42.7mm

Thickness

13mm

13.2mm

Lug-to-Lug

43.5mm

46.4mm

Lug Width

18mm

20mm

Material

316L Stainless Steel

Stainless Steel

Water Resistance

300m

200m

Crystal & Dial

3 specs

Crystal Shape

Flat

Curved

AR Coating

Inner

Anti-reflective coating on inner surface

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

Sellita SW220-1

6R35

Power Reserve

40h

70h

Jewels

Pricing

1 specs

MSRP

$1,800

$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.

Marathon OSAR-D (Original SAR with Date) Automatic 41mm

The Marathon OSAR-D (Original SAR with Date) Automatic 41mm is noted for its highly legible white dial with applied hour markers and a functional date magnifier, emphasizing its tool-watch purpose. Its Swiss-made Sellita SW200-1 movement is considered reliable and serviceable. One reviewer found the bracelet lacked refinement and preferred the rubber strap option. Overall, owners and reviewers appreciate the Marathon OSAR-D (Original SAR with Date) Automatic 41mm for its excellent legibility and robust movement.

Fratello

A Blog to Watch

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.

Hodinkee

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