Which is cheaper, the Seiko Prospex Sea The Black Series or the Undone Aquadeep Submerge Automatic?

At MSRP the Undone Aquadeep Submerge Automatic is the cheaper of the two at $395, against $765 for the Seiko Prospex Sea The Black Series — a $370 gap before any retailer discounting.

Which is bigger, the Seiko Prospex Sea The Black Series or the Undone Aquadeep Submerge Automatic?

The Seiko Prospex Sea The Black Series wears larger at 45mm versus 43mm for the Undone Aquadeep Submerge Automatic — a 2mm difference across the dial.

Which has better water resistance, the Seiko Prospex Sea The Black Series or the Undone Aquadeep Submerge Automatic?

The Undone Aquadeep Submerge Automatic is rated to 500m versus 200m for the Seiko Prospex Sea The Black Series.

What movement does the Seiko Prospex Sea The Black Series run compared to the Undone Aquadeep Submerge Automatic?

Both watches run automatic movements — the Seiko Prospex Sea The Black Series uses the Seiko 4R36 and the Undone Aquadeep Submerge Automatic uses the Seiko NH36.

Side by side

Seiko Prospex Sea The Black SeriesvsUndone Aquadeep Submerge Automatic

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

Add a watch

Seiko Prospex Sea The Black Series

MSRP $765

See the full Prospex Sea The Black Series

Undone Aquadeep Submerge Automatic

MSRP $395

See the full Aquadeep Submerge Automatic

At a glance

15 of 29 specs differ

Diameter

Prospex Sea The Black Series45mm

Aquadeep Submerge Automatic43mm

Power Reserve

Prospex Sea The Black Series41h

Aquadeep Submerge Automatic—

Water Resistance

Prospex Sea The Black Series200m

Aquadeep Submerge Automatic500m

MSRP

Prospex Sea The Black Series$765

Aquadeep Submerge Automatic$395

Full specifications

Case

7 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 4R36

Seiko NH36

Power Reserve

41h

Jewels

Pricing

1 specs

MSRP

$765

$395

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