Which is cheaper, the Formex Reef GMT or the Sheffield 1A?

At MSRP the Sheffield 1A is the cheaper of the two at $223, against $2,235 for the Formex Reef GMT — a $2,012 gap before any retailer discounting.

Which is bigger, the Formex Reef GMT or the Sheffield 1A?

The Formex Reef GMT wears larger at 42mm versus 40mm for the Sheffield 1A — a 2mm difference across the dial.

Which has better water resistance, the Formex Reef GMT or the Sheffield 1A?

The Formex Reef GMT is rated to 300m versus 200m for the Sheffield 1A.

What movement does the Formex Reef GMT run compared to the Sheffield 1A?

Both watches run automatic movements — the Formex Reef GMT uses the Sellita SW330-2 and the Sheffield 1A uses the Seiko NH35A.

Side by side

Formex Reef GMTvsSheffield 1A

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

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Formex Reef GMT

reef-gmt-42mm-automatic-cosc-300m-black-blue

MSRP $2,235

Sheffield 1A

diver-1a-40mm-white

MSRP $223

At a glance

11 of 29 specs differ

Diameter

Reef GMT42mm

1A40mm

Power Reserve

Reef GMT56h

1A—

Water Resistance

Reef GMT300m

1A200m

MSRP

Reef GMT$2,235

1A$223

Full specifications

Case

6 specs

Crystal & Dial

2 specs

Dial Color

Black

White/Blue

Lume

Super-LumiNova

Swiss blue lume

Movement

2 specs

Caliber

Sellita SW330-2

Seiko NH35A

Power Reserve

56h

—

Pricing

1 specs

MSRP

$2,235

$223

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Formex Reef GMTvsSheffield 1A

At a glance

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