Which is cheaper, the Marathon Steel Navigator SSNAV Auto or the Grand Seiko SBGW306?

At MSRP the Marathon Steel Navigator SSNAV Auto is the cheaper of the two at $1,300, against $17,900 for the Grand Seiko SBGW306 — a $16,600 gap before any retailer discounting.

Which is bigger, the Marathon Steel Navigator SSNAV Auto or the Grand Seiko SBGW306?

The Marathon Steel Navigator SSNAV Auto wears larger at 41mm versus 36.5mm for the Grand Seiko SBGW306 — a 4.5mm difference across the dial.

Which has better water resistance, the Marathon Steel Navigator SSNAV Auto or the Grand Seiko SBGW306?

The Grand Seiko SBGW306 is rated to 100m versus 60m for the Marathon Steel Navigator SSNAV Auto.

Which has a longer power reserve, the Marathon Steel Navigator SSNAV Auto or the Grand Seiko SBGW306?

The Grand Seiko SBGW306 carries a 72-hour power reserve against 40 hours on the Marathon Steel Navigator SSNAV Auto.

What movement does the Marathon Steel Navigator SSNAV Auto run compared to the Grand Seiko SBGW306?

The Marathon Steel Navigator SSNAV Auto runs a automatic caliber (Sellita SW200-1), while the Grand Seiko SBGW306 runs a manual (9S64).

Side by side

Marathon Steel Navigator SSNAV AutovsGrand Seiko SBGW306

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

Marathon Steel Navigator SSNAV Auto

41mm-steel-navigator-automatic-ssnav-auto-on-ballistic-nylon

MSRP $1,300

Grand Seiko SBGW306

sbgw306j

MSRP $17,900

At a glance

12 of 29 specs differ

Diameter

Steel Navigator SSNAV Auto41mm

SBGW30636.5mm

Power Reserve

Steel Navigator SSNAV Auto40h

SBGW30672h

Water Resistance

Steel Navigator SSNAV Auto60m

SBGW306100m

MSRP

Steel Navigator SSNAV Auto$1,300

SBGW306$17,900

Full specifications

Case

7 specs

Crystal & Dial

1 specs

AR Coating

Inner

Yes

Movement

3 specs

Caliber

Sellita SW200-1

9S64

Type

Automatic

Manual

Power Reserve

40h

72h

Pricing

1 specs

MSRP

$1,300

$17,900

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