Which is bigger, the Seiko Prospex Sea or the Sheffield 1A SCR II Blue?

The Seiko Prospex Sea wears larger at 42mm versus 40mm for the Sheffield 1A SCR II Blue — a 2mm difference across the dial.

Which has better water resistance, the Seiko Prospex Sea or the Sheffield 1A SCR II Blue?

The Seiko Prospex Sea is rated to 300m versus 200m for the Sheffield 1A SCR II Blue.

Which has a longer power reserve, the Seiko Prospex Sea or the Sheffield 1A SCR II Blue?

The Seiko Prospex Sea carries a 72-hour power reserve against 40 hours on the Sheffield 1A SCR II Blue.

What movement does the Seiko Prospex Sea run compared to the Sheffield 1A SCR II Blue?

Both watches run automatic movements — the Seiko Prospex Sea uses the 6R54 and the Sheffield 1A SCR II Blue uses the Seiko NH35.

Side by side

Seiko Prospex SeavsSheffield 1A SCR II Blue

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

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Seiko Prospex Sea

hbc001j1

Sheffield 1A SCR II Blue

1a-scr-ii-blue

MSRP $278

At a glance

12 of 29 specs differ

Diameter

Prospex Sea42mm

1A SCR II Blue40mm

Power Reserve

Prospex Sea72h

1A SCR II Blue40h

Water Resistance

Prospex Sea300m

1A SCR II Blue200m

MSRP

Prospex Sea—

1A SCR II Blue$278

Full specifications

Case

5 specs

Crystal & Dial

3 specs

AR Coating

Anti-reflective coating on inner surface

Inner

Dial Color

Black

Blue

Lume

LumiBrite on hands, index(es) and bezel

None

Movement

3 specs

Caliber

6R54

Seiko NH35

Power Reserve

72h

40h

Jewels

Pricing

1 specs

MSRP

—

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Seiko Prospex SeavsSheffield 1A SCR II Blue

At a glance

Full specifications

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