Which is cheaper, the Sheffield 1A 40mm or the Seiko Monster?

At MSRP the Sheffield 1A 40mm is the cheaper of the two at $228, against $550 for the Seiko Monster — a $322 gap before any retailer discounting.

Which is bigger, the Sheffield 1A 40mm or the Seiko Monster?

The Seiko Monster wears larger at 42.4mm versus 40mm for the Sheffield 1A 40mm — a 2.4mm difference across the dial.

Which has a longer power reserve, the Sheffield 1A 40mm or the Seiko Monster?

The Seiko Monster carries a 41-hour power reserve against 40 hours on the Sheffield 1A 40mm.

What movement does the Sheffield 1A 40mm run compared to the Seiko Monster?

Both watches run automatic movements — the Sheffield 1A 40mm uses the Seiko NH35 and the Seiko Monster uses the 4R36.

Side by side

Sheffield 1A 40mmvsSeiko Monster

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

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Sheffield 1A 40mm

allsport-1-auto

MSRP $228

Seiko Monster

srpe27

MSRP $550

At a glance

11 of 29 specs differ

Diameter

1A 40mm40mm

Monster42.4mm

Power Reserve

1A 40mm40h

Monster41h

Water Resistance

1A 40mm200m

Monster200m

MSRP

1A 40mm$228

Monster$550

Full specifications

Case

4 specs

Crystal & Dial

3 specs

Crystal

Sapphire

Hardlex

Dial Color

—

Black

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

Seiko NH35

4R36

Power Reserve

40h

41h

Jewels

Pricing

1 specs

MSRP

$228

$550

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Sheffield 1A 40mmvsSeiko Monster

At a glance

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