Which is cheaper, the Duckworth Prestex Belmont 300 Automatic or the Seiko Prospex Sea?

At MSRP the Duckworth Prestex Belmont 300 Automatic is the cheaper of the two at $750, against $900 for the Seiko Prospex Sea — a $150 gap before any retailer discounting.

Which is bigger, the Duckworth Prestex Belmont 300 Automatic or the Seiko Prospex Sea?

The Duckworth Prestex Belmont 300 Automatic wears larger at 42mm versus 41mm for the Seiko Prospex Sea — a 1mm difference across the dial.

Which has better water resistance, the Duckworth Prestex Belmont 300 Automatic or the Seiko Prospex Sea?

The Duckworth Prestex Belmont 300 Automatic is rated to 300m versus 200m for the Seiko Prospex Sea.

Which has a longer power reserve, the Duckworth Prestex Belmont 300 Automatic or the Seiko Prospex Sea?

The Seiko Prospex Sea carries a 70-hour power reserve against 38 hours on the Duckworth Prestex Belmont 300 Automatic.

What movement does the Duckworth Prestex Belmont 300 Automatic run compared to the Seiko Prospex Sea?

Both watches run automatic movements — the Duckworth Prestex Belmont 300 Automatic uses the Miyota 9039 and the Seiko Prospex Sea uses the 6R35.

Side by side

Duckworth Prestex Belmont 300 AutomaticvsSeiko Prospex Sea

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

Add a watch

Duckworth Prestex Belmont 300 Automatic

belmont-300

MSRP $750

Seiko Prospex Sea

spb317j1

MSRP $900

Buy from Duckworth Prestex ↗

Buy used on eBay ↗

Buy from Seiko ↗

Buy used on eBay ↗

At a glance

13 of 29 specs differ

Diameter

Belmont 300 Automatic42mm

Prospex Sea41mm

Power Reserve

Belmont 300 Automatic38h

Prospex Sea70h

Water Resistance

Belmont 300 Automatic300m

Prospex Sea200m

MSRP

Belmont 300 Automatic$750

Prospex Sea$900

Full specifications

Case

5 specs

Crystal & Dial

4 specs

Crystal Shape

Flat

Curved

AR Coating

Inner

Anti-reflective coating on inner surface

Dial Color

—

Black

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

Miyota 9039

6R35

Power Reserve

38h

70h

Jewels

Pricing

1 specs

MSRP

$750

$900

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Duckworth Prestex Belmont 300 AutomaticvsSeiko Prospex Sea

At a glance

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