Which is cheaper, the Seiko Prospex Sea or the Straton Syncro MKII Mechanical Chrono?

At MSRP the Straton Syncro MKII Mechanical Chrono is the cheaper of the two at $599, against $1,500 for the Seiko Prospex Sea — a $901 gap before any retailer discounting.

Which is bigger, the Seiko Prospex Sea or the Straton Syncro MKII Mechanical Chrono?

The Seiko Prospex Sea wears larger at 43.5mm versus 40mm for the Straton Syncro MKII Mechanical Chrono — a 3.5mm difference across the dial.

Which has better water resistance, the Seiko Prospex Sea or the Straton Syncro MKII Mechanical Chrono?

The Seiko Prospex Sea is rated to 200m versus 100m for the Straton Syncro MKII Mechanical Chrono.

What movement does the Seiko Prospex Sea run compared to the Straton Syncro MKII Mechanical Chrono?

The Seiko Prospex Sea runs a automatic caliber (6R35), while the Straton Syncro MKII Mechanical Chrono runs a manual (Seagull ST19).

Side by side

Seiko Prospex SeavsStraton Straton Syncro MKII Mechanical Chrono

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

Seiko Prospex Sea

spb349j1

MSRP $1,500

Straton Straton Syncro MKII Mechanical Chrono

straton-syncro-mkii-mechanical-chrono

MSRP $599

At a glance

20 of 29 specs differ

Diameter

Prospex Sea43.5mm

Straton Syncro MKII Mechanical Chrono40mm

Power Reserve

Prospex Sea70h

Straton Syncro MKII Mechanical Chrono—

Water Resistance

Prospex Sea200m

Straton Syncro MKII Mechanical Chrono100m

MSRP

Prospex Sea$1,500

Straton Syncro MKII Mechanical Chrono$599

Full specifications

Case

9 specs

Crystal & Dial

5 specs

Crystal Shape

Flat

Domed

AR Coating

Anti-reflective coating on inner surface

Underside

Dial Color

Black

—

Indices

Applied

—

Lume

LumiBrite on hands and index(es)

None

Movement

5 specs

Caliber

6R35

Seagull ST19

Type

Automatic

Manual

Beat Rate

28,800 vph

0 vph

Power Reserve

70h

Jewels

Pricing

1 specs

MSRP

$1,500

$599

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