Which is cheaper, the Grand Seiko SBGW306 or the Spinnaker Spence 300?

At MSRP the Spinnaker Spence 300 is the cheaper of the two at $650, against $17,900 for the Grand Seiko SBGW306 — a $17,250 gap before any retailer discounting.

Which is bigger, the Grand Seiko SBGW306 or the Spinnaker Spence 300?

The Spinnaker Spence 300 wears larger at 40mm versus 36.5mm for the Grand Seiko SBGW306 — a 3.5mm difference across the dial.

Which has better water resistance, the Grand Seiko SBGW306 or the Spinnaker Spence 300?

The Spinnaker Spence 300 is rated to 300m versus 100m for the Grand Seiko SBGW306.

Which has a longer power reserve, the Grand Seiko SBGW306 or the Spinnaker Spence 300?

The Grand Seiko SBGW306 carries a 72-hour power reserve against 40 hours on the Spinnaker Spence 300.

What movement does the Grand Seiko SBGW306 run compared to the Spinnaker Spence 300?

The Grand Seiko SBGW306 runs a manual caliber (9S64), while the Spinnaker Spence 300 runs a automatic (SII NH35A).

Side by side

Grand Seiko SBGW306vsSpinnaker Spence 300

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

Grand Seiko SBGW306

sbgw306j

MSRP $17,900

Spinnaker Spence 300

spence-300-automatic-aquamarine-sp-5097-aa

MSRP $650

At a glance

13 of 29 specs differ

Diameter

SBGW30636.5mm

Spence 30040mm

Power Reserve

SBGW30672h

Spence 30040h

Water Resistance

SBGW306100m

Spence 300300m

MSRP

SBGW306$17,900

Spence 300$650

Full specifications

Case

7 specs

Crystal & Dial

2 specs

AR Coating

Yes

Inner

Dial Color

Black

Aquamarine

Movement

3 specs

Caliber

9S64

SII NH35A

Type

Manual

Automatic

Power Reserve

72h

40h

Pricing

1 specs

MSRP

$17,900

$650

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Grand Seiko SBGW306vsSpinnaker Spence 300

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