Which is cheaper, the Helgray Poseidon Diver (Automatic) or the Grand Seiko SBGR321?

At MSRP the Helgray Poseidon Diver (Automatic) is the cheaper of the two at $249, against $5,200 for the Grand Seiko SBGR321 — a $4,951 gap before any retailer discounting.

Which has better water resistance, the Helgray Poseidon Diver (Automatic) or the Grand Seiko SBGR321?

The Helgray Poseidon Diver (Automatic) is rated to 300m versus 100m for the Grand Seiko SBGR321.

Which has a longer power reserve, the Helgray Poseidon Diver (Automatic) or the Grand Seiko SBGR321?

The Grand Seiko SBGR321 carries a 72-hour power reserve against 40 hours on the Helgray Poseidon Diver (Automatic).

What movement does the Helgray Poseidon Diver (Automatic) run compared to the Grand Seiko SBGR321?

Both watches run automatic movements — the Helgray Poseidon Diver (Automatic) uses the NH35 Warranty and the Grand Seiko SBGR321 uses the 9S65.

Side by side

Helgray Poseidon Diver (Automatic)vsGrand Seiko SBGR321

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

Helgray Poseidon Diver (Automatic)

poseidon-diver-automatic

MSRP $249

Grand Seiko SBGR321

sbgr321g

MSRP $5,200

At a glance

8 of 29 specs differ

Diameter

Poseidon Diver (Automatic)40mm

SBGR32140mm

Power Reserve

Poseidon Diver (Automatic)40h

SBGR32172h

Water Resistance

Poseidon Diver (Automatic)300m

SBGR321100m

MSRP

Poseidon Diver (Automatic)$249

SBGR321$5,200

Full specifications

Case

4 specs

Crystal & Dial

1 specs

AR Coating

Inner

Yes

Movement

2 specs

Caliber

NH35 Warranty

9S65

Power Reserve

40h

72h

Pricing

1 specs

MSRP

$249

$5,200

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