Which is cheaper, the Seiko Prospex Sea PADI Special Edition or the Undone 420 Cali Automatic?

At MSRP the Undone 420 Cali Automatic is the cheaper of the two at $340, against $650 for the Seiko Prospex Sea PADI Special Edition — a $310 gap before any retailer discounting.

Which is bigger, the Seiko Prospex Sea PADI Special Edition or the Undone 420 Cali Automatic?

The Seiko Prospex Sea PADI Special Edition wears larger at 41.7mm versus 40mm for the Undone 420 Cali Automatic — a 1.7mm difference across the dial.

Which has better water resistance, the Seiko Prospex Sea PADI Special Edition or the Undone 420 Cali Automatic?

The Seiko Prospex Sea PADI Special Edition is rated to 200m versus 100m for the Undone 420 Cali Automatic.

What movement does the Seiko Prospex Sea PADI Special Edition run compared to the Undone 420 Cali Automatic?

Both watches run automatic movements — the Seiko Prospex Sea PADI Special Edition uses the Seiko 4R35 and the Undone 420 Cali Automatic uses the NH35.

Side by side

Seiko Prospex Sea PADI Special EditionvsUndone 420 Cali Automatic

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

Add a watch

Seiko Prospex Sea PADI Special Edition

MSRP $650

See the full Prospex Sea PADI Special Edition

Undone 420 Cali Automatic

MSRP $340

See the full 420 Cali Automatic

At a glance

13 of 29 specs differ

Diameter

Prospex Sea PADI Special Edition41.7mm

420 Cali Automatic40mm

Power Reserve

Prospex Sea PADI Special Edition41h

420 Cali Automatic—

Water Resistance

Prospex Sea PADI Special Edition200m

420 Cali Automatic100m

MSRP

Prospex Sea PADI Special Edition$650

420 Cali Automatic$340

Full specifications

Case

6 specs

Crystal & Dial

3 specs

Crystal

Hardlex

—

Dial Color

—

Lume

LumiBrite on hands, index(es) and bezel

None

Movement

3 specs

Caliber

Seiko 4R35

NH35

Power Reserve

41h

—

Jewels

Pricing

1 specs

MSRP

$650

$340

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Seiko Prospex Sea PADI Special EditionvsUndone 420 Cali Automatic

At a glance

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