Which is cheaper, the Core Timepieces Original Sin or the Seiko Prospex Sea?

At MSRP the Core Timepieces Original Sin is the cheaper of the two at $549, against $900 for the Seiko Prospex Sea — a $351 gap before any retailer discounting.

Which is bigger, the Core Timepieces Original Sin or the Seiko Prospex Sea?

The Core Timepieces Original Sin wears larger at 42mm versus 41mm for the Seiko Prospex Sea — a 1mm difference across the dial.

Which has better water resistance, the Core Timepieces Original Sin or the Seiko Prospex Sea?

The Core Timepieces Original Sin is rated to 300m versus 200m for the Seiko Prospex Sea.

What movement does the Core Timepieces Original Sin run compared to the Seiko Prospex Sea?

Both watches run automatic movements — the Core Timepieces Original Sin uses the Seiko NH36A and the Seiko Prospex Sea uses the 6R35.

Side by side

Core Timepieces Original SinvsSeiko Prospex Sea

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

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Core Timepieces Original Sin

MSRP $549

Seiko Prospex Sea

spb317j1

MSRP $900

Buy from Core Timepieces ↗

Buy used on eBay ↗

Buy from Seiko ↗

Buy used on eBay ↗

At a glance

15 of 29 specs differ

Diameter

Original Sin42mm

Prospex Sea41mm

Power Reserve

Original Sin—

Prospex Sea70h

Water Resistance

Original Sin300m

Prospex Sea200m

MSRP

Original Sin$549

Prospex Sea$900

Full specifications

Case

7 specs

Crystal & Dial

4 specs

Crystal Shape

Flat

Curved

AR Coating

Inner

Anti-reflective coating on inner surface

Dial Color

Red

Black

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

Seiko NH36A

6R35

Power Reserve

—

70h

Jewels

Pricing

1 specs

MSRP

—

$900

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—Used

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Core Timepieces Original SinvsSeiko Prospex Sea

At a glance

Full specifications

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