Which is cheaper, the Marathon Steel Navigator SSNAV-D Auto or the Grand Seiko STGF387?

At MSRP the Marathon Steel Navigator SSNAV-D Auto is the cheaper of the two at $1,400, against $4,200 for the Grand Seiko STGF387 — a $2,800 gap before any retailer discounting.

Which is bigger, the Marathon Steel Navigator SSNAV-D Auto or the Grand Seiko STGF387?

The Marathon Steel Navigator SSNAV-D Auto wears larger at 41mm versus 26mm for the Grand Seiko STGF387 — a 15mm difference across the dial.

Which has better water resistance, the Marathon Steel Navigator SSNAV-D Auto or the Grand Seiko STGF387?

The Grand Seiko STGF387 is rated to 100m versus 60m for the Marathon Steel Navigator SSNAV-D Auto.

What movement does the Marathon Steel Navigator SSNAV-D Auto run compared to the Grand Seiko STGF387?

The Marathon Steel Navigator SSNAV-D Auto runs a automatic caliber (Sellita SW220-1), while the Grand Seiko STGF387 runs a quartz (4J51).

Side by side

Marathon Steel Navigator SSNAV-D AutovsGrand Seiko STGF387

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

Marathon Steel Navigator SSNAV-D Auto

41mm-steel-navigator-automatic-w-date-ssnav-d-on-ballistic-nylon

MSRP $1,400

Grand Seiko STGF387

stgf387g

MSRP $4,200

At a glance

11 of 29 specs differ

Diameter

Steel Navigator SSNAV-D Auto41mm

STGF38726mm

Power Reserve

Steel Navigator SSNAV-D Auto40h

STGF38740h

Water Resistance

Steel Navigator SSNAV-D Auto60m

STGF387100m

MSRP

Steel Navigator SSNAV-D Auto$1,400

STGF387$4,200

Full specifications

Case

7 specs

Crystal & Dial

1 specs

AR Coating

Inner

Yes

Movement

2 specs

Caliber

Sellita SW220-1

4J51

Type

Automatic

Quartz

Pricing

1 specs

MSRP

$1,400

$4,200

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