Which is cheaper, the Helgray Poseidon Diver (Automatic) or the Grand Seiko SLGA015?

At MSRP the Helgray Poseidon Diver (Automatic) is the cheaper of the two at $249, against $12,600 for the Grand Seiko SLGA015 — a $12,351 gap before any retailer discounting.

Which is bigger, the Helgray Poseidon Diver (Automatic) or the Grand Seiko SLGA015?

The Grand Seiko SLGA015 wears larger at 43.8mm versus 40mm for the Helgray Poseidon Diver (Automatic) — a 3.8mm difference across the dial.

Which has better water resistance, the Helgray Poseidon Diver (Automatic) or the Grand Seiko SLGA015?

The Helgray Poseidon Diver (Automatic) is rated to 300m versus 200m for the Grand Seiko SLGA015.

Which has a longer power reserve, the Helgray Poseidon Diver (Automatic) or the Grand Seiko SLGA015?

The Grand Seiko SLGA015 carries a 120-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 SLGA015?

The Helgray Poseidon Diver (Automatic) runs a automatic caliber (NH35 Warranty), while the Grand Seiko SLGA015 runs a spring drive (9RA5).

Side by side

Helgray Poseidon Diver (Automatic)vsGrand Seiko SLGA015

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 SLGA015

slga015g

MSRP $12,600

At a glance

11 of 29 specs differ

Diameter

Poseidon Diver (Automatic)40mm

SLGA01543.8mm

Power Reserve

Poseidon Diver (Automatic)40h

SLGA015120h

Water Resistance

Poseidon Diver (Automatic)300m

SLGA015200m

MSRP

Poseidon Diver (Automatic)$249

SLGA015$12,600

Full specifications

Case

6 specs

Diameter

40mm

43.8mm

Thickness

12mm

13.8mm

Lug-to-Lug

46mm

51.5mm

Lug Width

20mm

23mm

Material

Stainless Steel

Titanium

Water Resistance

300m

200m

Crystal & Dial

1 specs

AR Coating

Inner

Yes

Movement

3 specs

Caliber

NH35 Warranty

9RA5

Type

Automatic

Spring Drive

Power Reserve

40h

120h

Pricing

1 specs

MSRP

$249

$12,600

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