Which is cheaper, the Helgray Poseidon Diver (Automatic) or the Seiko Prospex Sea Save the Ocean Special Edition?

At MSRP the Helgray Poseidon Diver (Automatic) is the cheaper of the two at $249, against $650 for the Seiko Prospex Sea Save the Ocean Special Edition — a $401 gap before any retailer discounting.

Which is bigger, the Helgray Poseidon Diver (Automatic) or the Seiko Prospex Sea Save the Ocean Special Edition?

The Seiko Prospex Sea Save the Ocean Special Edition 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 Seiko Prospex Sea Save the Ocean Special Edition?

The Helgray Poseidon Diver (Automatic) is rated to 300m versus 200m for the Seiko Prospex Sea Save the Ocean Special Edition.

Which has a longer power reserve, the Helgray Poseidon Diver (Automatic) or the Seiko Prospex Sea Save the Ocean Special Edition?

The Seiko Prospex Sea Save the Ocean Special Edition carries a 41-hour power reserve against 40 hours on the Helgray Poseidon Diver (Automatic).

What movement does the Helgray Poseidon Diver (Automatic) run compared to the Seiko Prospex Sea Save the Ocean Special Edition?

Both watches run automatic movements — the Helgray Poseidon Diver (Automatic) uses the NH35 Warranty and the Seiko Prospex Sea Save the Ocean Special Edition uses the 4R35.

Side by side

Helgray Poseidon Diver (Automatic)vsSeiko Prospex Sea Save the Ocean Special Edition

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

Seiko Prospex Sea Save the Ocean Special Edition

srpe33

MSRP $650

At a glance

11 of 29 specs differ

Diameter

Poseidon Diver (Automatic)40mm

Prospex Sea Save the Ocean Special Edition43.8mm

Power Reserve

Poseidon Diver (Automatic)40h

Prospex Sea Save the Ocean Special Edition41h

Water Resistance

Poseidon Diver (Automatic)300m

Prospex Sea Save the Ocean Special Edition200m

MSRP

Poseidon Diver (Automatic)$249

Prospex Sea Save the Ocean Special Edition$650

Full specifications

Case

5 specs

Diameter

40mm

43.8mm

Thickness

12mm

12.8mm

Lug-to-Lug

46mm

48.7mm

Lug Width

20mm

22mm

Water Resistance

300m

200m

Crystal & Dial

2 specs

AR Coating

Inner

Anti-reflective coating on inner surface

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

NH35 Warranty

4R35

Power Reserve

40h

41h

Jewels

Pricing

1 specs

MSRP

$249

$650

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