Which is cheaper, the Grand Seiko SBGM221 or the Spinnaker Dumas Automatic?

At MSRP the Spinnaker Dumas Automatic is the cheaper of the two at $239, against $5,400 for the Grand Seiko SBGM221 — a $5,161 gap before any retailer discounting.

Which is bigger, the Grand Seiko SBGM221 or the Spinnaker Dumas Automatic?

The Spinnaker Dumas Automatic wears larger at 44mm versus 39.5mm for the Grand Seiko SBGM221 — a 4.5mm difference across the dial.

Which has better water resistance, the Grand Seiko SBGM221 or the Spinnaker Dumas Automatic?

The Spinnaker Dumas Automatic is rated to 300m versus 30m for the Grand Seiko SBGM221.

Which has a longer power reserve, the Grand Seiko SBGM221 or the Spinnaker Dumas Automatic?

The Grand Seiko SBGM221 carries a 72-hour power reserve against 40 hours on the Spinnaker Dumas Automatic.

What movement does the Grand Seiko SBGM221 run compared to the Spinnaker Dumas Automatic?

Both watches run automatic movements — the Grand Seiko SBGM221 uses the 9S66 and the Spinnaker Dumas Automatic uses the SII NH35A.

Side by side

Grand Seiko SBGM221vsSpinnaker Dumas Automatic

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

Grand Seiko SBGM221

sbgm221g

MSRP $5,400

Spinnaker Dumas Automatic

dumas-blue-yonder-sp-5081-dd

MSRP $239

At a glance

12 of 29 specs differ

Diameter

SBGM22139.5mm

Dumas Automatic44mm

Power Reserve

SBGM22172h

Dumas Automatic40h

Water Resistance

SBGM22130m

Dumas Automatic300m

MSRP

SBGM221$5,400

Dumas Automatic$239

Full specifications

Case

7 specs

Crystal & Dial

2 specs

AR Coating

Yes

Inner

Dial Color

Black

Blue

Movement

2 specs

Caliber

9S66

SII NH35A

Power Reserve

72h

40h

Pricing

1 specs

MSRP

$5,400

$239

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What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Grand Seiko SBGM221

Grand Seiko SBGM221 is widely praised for its exceptional dial finish, highly polished hands and indices, and elegant design. Owners consistently highlight the stunning craftsmanship, with specific mention of the up to 11 hand-polished facets on its rectangular markers. The reliable 9S66 movement is noted for its 72-hour power reserve and true GMT functionality, tested beyond Chronometer specifications. Some enthusiasts desire a bidirectional 24-hour bezel, which the Grand Seiko SBGM221 lacks, and its 13.7mm thickness and 19mm lug width are noted as potential limitations. On balance, owners rate the Grand Seiko SBGM221 highly for its exquisite finishing and elegant, comfortable design.

From video reviewers

The SBGM221 is praised for its value within the Grand Seiko lineup. The lug width is cited as a weakness.

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Spinnaker Dumas Automatic

Owners widely praise the Spinnaker Dumas Automatic for its attractive textured blue dial, applied indices, and well-finished case, noting its comfortable wearability due to a short lug-to-lug distance. Some owners flag the use of mineral crystal instead of sapphire and a bracelet with a learning curve and loose keeper. Overall, owners rate the Spinnaker Dumas Automatic highly for its aesthetics and case finishing at its price point.

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