Which is cheaper, the Helgray Poseidon Diver (Automatic) or the Grand Seiko SLGH017?

At MSRP the Helgray Poseidon Diver (Automatic) is the cheaper of the two at $249, against $10,500 for the Grand Seiko SLGH017 — a $10,251 gap before any retailer discounting.

Which has better water resistance, the Helgray Poseidon Diver (Automatic) or the Grand Seiko SLGH017?

The Helgray Poseidon Diver (Automatic) is rated to 300m versus 100m for the Grand Seiko SLGH017.

Which has a longer power reserve, the Helgray Poseidon Diver (Automatic) or the Grand Seiko SLGH017?

The Grand Seiko SLGH017 carries a 80-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 SLGH017?

Both watches run automatic movements — the Helgray Poseidon Diver (Automatic) uses the NH35 Warranty and the Grand Seiko SLGH017 uses the 9SA5.

Side by side

Helgray Poseidon Diver (Automatic)vsGrand Seiko SLGH017

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 SLGH017

slgh017g

MSRP $10,500

At a glance

10 of 29 specs differ

Diameter

Poseidon Diver (Automatic)40mm

SLGH01740mm

Power Reserve

Poseidon Diver (Automatic)40h

SLGH01780h

Water Resistance

Poseidon Diver (Automatic)300m

SLGH017100m

MSRP

Poseidon Diver (Automatic)$249

SLGH017$10,500

Full specifications

Case

6 specs

Crystal & Dial

1 specs

AR Coating

Inner

Yes

Movement

2 specs

Caliber

NH35 Warranty

9SA5

Power Reserve

40h

80h

Pricing

1 specs

MSRP

$249

$10,500

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