Which has better water resistance, the Seiko Prospex Sea or the Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)?

The Seiko Prospex Sea is rated to 300m versus 200m for the Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap).

What movement does the Seiko Prospex Sea run compared to the Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)?

Both watches run automatic movements — the Seiko Prospex Sea uses the 6R54 and the Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap) uses the Seiko NH35.

Side by side

Seiko Prospex SeavsSheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)

Q: Which is bigger, the Seiko Prospex Sea or the Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)?

The Seiko Prospex Sea wears larger at 42mm versus 38mm for the Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap) — a 4mm difference across the dial.

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

Add a watch

Seiko Prospex Sea

hbc001j1

Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)

MSRP $223

At a glance

11 of 29 specs differ

Diameter

Prospex Sea42mm

1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)38mm

Power Reserve

Prospex Sea72h

1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)—

Water Resistance

Prospex Sea300m

1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)200m

MSRP

Prospex Sea—

1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)$223

Full specifications

Case

4 specs

Diameter

42mm

38mm

Thickness

13.3mm

12.8mm

Lug-to-Lug

48.6mm

46mm

Water Resistance

300m

200m

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

—

Jewels

Pricing

1 specs

MSRP

—

$223

Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Borealis Watch Co.micro

Follow this matchup

Get a note when Seiko Prospex Sea vs Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap) gets more votes, a community discussion, or a price drop. No account needed.

Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.

Borealis Watch Co. JamantavsSheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)Borealis Watch Co. Caloura 300mvsSheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)Borealis Watch Co. Estoril 300 GMTvsSheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)Boldr Odyssey FreedivervsSheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)Seiko Prospex SeavsSheffield 1A 38 Seiko Prospex SeavsSheffield 1A

Edit this comparison Add another watch More diver comparisons Best Diver Watches Under $5,000 Explore more 37–43mm watches

Seiko Prospex SeavsSheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)

At a glance

Full specifications

More watches worth a look

Jamanta

Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311

Caloura 300m

Swordfish 3

The T Rex By Boldr X Nitecore

Odyssey Freediver

Fearless

Aquascaphe Titanium

Follow this matchup

People also compared