Which is cheaper, the Seiko Prospex Sea or the Undone x Birdwell Beige Automatic?

At MSRP the Undone x Birdwell Beige Automatic is the cheaper of the two at $500, against $625 for the Seiko Prospex Sea — a $125 gap before any retailer discounting.

Which is bigger, the Seiko Prospex Sea or the Undone x Birdwell Beige Automatic?

The Seiko Prospex Sea wears larger at 43.8mm versus 43mm for the Undone x Birdwell Beige Automatic — a 0.8mm difference across the dial.

Which has better water resistance, the Seiko Prospex Sea or the Undone x Birdwell Beige Automatic?

The Undone x Birdwell Beige Automatic is rated to 300m versus 200m for the Seiko Prospex Sea.

What movement does the Seiko Prospex Sea run compared to the Undone x Birdwell Beige Automatic?

Both watches run automatic movements — the Seiko Prospex Sea uses the Seiko 4R35 and the Undone x Birdwell Beige Automatic uses the Seiko NH35.

Side by side

Seiko Prospex SeavsUndone x Birdwell Beige Automatic

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

Add a watch

Seiko Prospex Sea

MSRP $625

See the full Prospex Sea

Undone x Birdwell Beige Automatic

MSRP $500

See the full x Birdwell Beige Automatic

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At a glance

14 of 29 specs differ

Diameter

Prospex Sea43.8mm

x Birdwell Beige Automatic43mm

Power Reserve

Prospex Sea41h

x Birdwell Beige Automatic—

Water Resistance

Prospex Sea200m

x Birdwell Beige Automatic300m

MSRP

Prospex Sea$625

x Birdwell Beige Automatic$500

Full specifications

Case

6 specs

Crystal & Dial

4 specs

Crystal

Sapphire

—

AR Coating

Anti-reflective coating on inner surface

—

Dial Color

—

Lume

LumiBrite on hands, index(es) and bezel

None

Movement

3 specs

Caliber

Seiko 4R35

Seiko NH35

Power Reserve

41h

—

Jewels

Pricing

1 specs

MSRP

$625

$500

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Seiko Prospex SeavsUndone x Birdwell Beige Automatic

At a glance

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