Which is cheaper, the Sheffield 1A or the Seiko 5KX?

At MSRP the Sheffield 1A is the cheaper of the two at $223, against $350 for the Seiko 5KX — a $127 gap before any retailer discounting.

Which is bigger, the Sheffield 1A or the Seiko 5KX?

The Seiko 5KX wears larger at 42.5mm versus 40mm for the Sheffield 1A — a 2.5mm difference across the dial.

Which has better water resistance, the Sheffield 1A or the Seiko 5KX?

The Sheffield 1A is rated to 200m versus 10m for the Seiko 5KX.

What movement does the Sheffield 1A run compared to the Seiko 5KX?

Both watches run automatic movements — the Sheffield 1A uses the Seiko NH35A and the Seiko 5KX uses the 4R36.

Side by side

Sheffield 1AvsSeiko 5KX

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

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Sheffield 1A

diver-1a-40mm-white

MSRP $223

Seiko 5KX

srpd51

MSRP $350

At a glance

11 of 29 specs differ

Diameter

1A40mm

5KX42.5mm

Power Reserve

1A—

5KX41h

Water Resistance

1A200m

5KX100m

MSRP

1A$223

5KX$350

Full specifications

Case

4 specs

Diameter

40mm

42.5mm

Thickness

12.8mm

13.4mm

Lug Width

20mm

22mm

Water Resistance

200m

100m

Crystal & Dial

3 specs

Crystal

Sapphire

Hardlex

Dial Color

White/Blue

Black

Lume

Swiss blue lume

LumiBrite on hands and index(es)

Movement

3 specs

Caliber

Seiko NH35A

4R36

Power Reserve

—

41h

Jewels

Pricing

1 specs

MSRP

$223

$350

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Sheffield 1AvsSeiko 5KX

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