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

At MSRP the Undone Ronin Automatic is the cheaper of the two at $380, against $650 for the Seiko Prospex Sea PADI Special Edition — a $270 gap before any retailer discounting.

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

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

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

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

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

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

Side by side

Seiko Prospex Sea PADI Special EditionvsUndone Ronin 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 Ronin Automatic

MSRP $380

See the full Ronin Automatic

At a glance

13 of 29 specs differ

Diameter

Prospex Sea PADI Special Edition41.7mm

Ronin Automatic40mm

Power Reserve

Prospex Sea PADI Special Edition41h

Ronin Automatic—

Water Resistance

Prospex Sea PADI Special Edition200m

Ronin Automatic100m

MSRP

Prospex Sea PADI Special Edition$650

Ronin Automatic$380

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

Seiko NH35

Power Reserve

41h

—

Jewels

Pricing

1 specs

MSRP

$650

$380

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Seiko Prospex Sea PADI Special EditionvsUndone Ronin Automatic

At a glance

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