Which is cheaper, the AVI-8 Flyboy Airmaster GMT Automatic or the Grand Seiko STGF387?

At MSRP the AVI-8 Flyboy Airmaster GMT Automatic is the cheaper of the two at $365, against $4,200 for the Grand Seiko STGF387 — a $3,835 gap before any retailer discounting.

Which is bigger, the AVI-8 Flyboy Airmaster GMT Automatic or the Grand Seiko STGF387?

The AVI-8 Flyboy Airmaster GMT Automatic wears larger at 40mm versus 26mm for the Grand Seiko STGF387 — a 14mm difference across the dial.

Which has better water resistance, the AVI-8 Flyboy Airmaster GMT Automatic or the Grand Seiko STGF387?

The Grand Seiko STGF387 is rated to 100m versus 50m for the AVI-8 Flyboy Airmaster GMT Automatic.

What movement does the AVI-8 Flyboy Airmaster GMT Automatic run compared to the Grand Seiko STGF387?

The AVI-8 Flyboy Airmaster GMT Automatic runs a automatic caliber (NH34), while the Grand Seiko STGF387 runs a quartz (4J51).

Side by side

AVI-8 Flyboy Airmaster GMT AutomaticvsGrand Seiko STGF387

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

AVI-8 Flyboy Airmaster GMT Automatic

flyboy-airmaster-gmt-automatic-engine-black-av-4128-01

MSRP $365

Grand Seiko STGF387

stgf387g

MSRP $4,200

At a glance

11 of 29 specs differ

Diameter

Flyboy Airmaster GMT Automatic40mm

STGF38726mm

Power Reserve

Flyboy Airmaster GMT Automatic40h

STGF38740h

Water Resistance

Flyboy Airmaster GMT Automatic50m

STGF387100m

MSRP

Flyboy Airmaster GMT Automatic$365

STGF387$4,200

Full specifications

Case

7 specs

Crystal & Dial

1 specs

AR Coating

Inner

Yes

Movement

2 specs

Caliber

NH34

4J51

Type

Automatic

Quartz

Pricing

1 specs

MSRP

$365

$4,200

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