Which is cheaper, the Helgray Poseidon Diver (Automatic) or the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch?

At MSRP the Helgray Poseidon Diver (Automatic) is the cheaper of the two at $249, against $2,900 for the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch — a $2,651 gap before any retailer discounting.

Which is bigger, the Helgray Poseidon Diver (Automatic) or the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch?

The Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch wears larger at 42.6mm versus 40mm for the Helgray Poseidon Diver (Automatic) — a 2.6mm difference across the dial.

Which has a longer power reserve, the Helgray Poseidon Diver (Automatic) or the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch?

The Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch carries a 50-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 Marinemaster Marinemaster 1968 Heritage Diver's Watch?

Both watches run automatic movements — the Helgray Poseidon Diver (Automatic) uses the NH35 Warranty and the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch uses the 8L35.

Side by side

Helgray Poseidon Diver (Automatic)vsSeiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch

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 Marinemaster Marinemaster 1968 Heritage Diver's Watch

sla077j1

MSRP $2,900

At a glance

10 of 29 specs differ

Diameter

Poseidon Diver (Automatic)40mm

Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch42.6mm

Power Reserve

Poseidon Diver (Automatic)40h

Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch50h

Water Resistance

Poseidon Diver (Automatic)300m

Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch300m

MSRP

Poseidon Diver (Automatic)$249

Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch$2,900

Full specifications

Case

3 specs

Diameter

40mm

42.6mm

Thickness

12mm

13.4mm

Lug-to-Lug

46mm

49.3mm

Crystal & Dial

3 specs

Crystal Shape

Flat

Curved

AR Coating

Inner

Anti-reflective coating on inner surface

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

NH35 Warranty

8L35

Power Reserve

40h

50h

Jewels

Pricing

1 specs

MSRP

$249

$2,900

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