Which is cheaper, the Seiko Prospex Sea 1968 Heritage Diver's GMT or the Helgray Speedster (Racing Light Blue)?

At MSRP the Helgray Speedster (Racing Light Blue) is the cheaper of the two at $299, against $1,500 for the Seiko Prospex Sea 1968 Heritage Diver's GMT — a $1,201 gap before any retailer discounting.

Which is bigger, the Seiko Prospex Sea 1968 Heritage Diver's GMT or the Helgray Speedster (Racing Light Blue)?

The Seiko Prospex Sea 1968 Heritage Diver's GMT wears larger at 42mm versus 39mm for the Helgray Speedster (Racing Light Blue) — a 3mm difference across the dial.

Which has better water resistance, the Seiko Prospex Sea 1968 Heritage Diver's GMT or the Helgray Speedster (Racing Light Blue)?

The Seiko Prospex Sea 1968 Heritage Diver's GMT is rated to 200m versus 30m for the Helgray Speedster (Racing Light Blue).

Which has a longer power reserve, the Seiko Prospex Sea 1968 Heritage Diver's GMT or the Helgray Speedster (Racing Light Blue)?

The Seiko Prospex Sea 1968 Heritage Diver's GMT carries a 72-hour power reserve against 40 hours on the Helgray Speedster (Racing Light Blue).

What movement does the Seiko Prospex Sea 1968 Heritage Diver's GMT run compared to the Helgray Speedster (Racing Light Blue)?

Both watches run automatic movements — the Seiko Prospex Sea 1968 Heritage Diver's GMT uses the 6R54 and the Helgray Speedster (Racing Light Blue) uses the Miyota 6S21.

Side by side

Seiko Prospex Sea 1968 Heritage Diver's GMTvsHelgray Speedster (Racing Light Blue)

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

Seiko Prospex Sea 1968 Heritage Diver's GMT

spb381j1

MSRP $1,500

Helgray Speedster (Racing Light Blue)

speedster-racing-light-blue

MSRP $299

At a glance

11 of 29 specs differ

Diameter

Prospex Sea 1968 Heritage Diver's GMT42mm

Speedster (Racing Light Blue)39mm

Power Reserve

Prospex Sea 1968 Heritage Diver's GMT72h

Speedster (Racing Light Blue)40h

Water Resistance

Prospex Sea 1968 Heritage Diver's GMT200m

Speedster (Racing Light Blue)30m

MSRP

Prospex Sea 1968 Heritage Diver's GMT$1,500

Speedster (Racing Light Blue)$299

Full specifications

Case

5 specs

Crystal & Dial

2 specs

AR Coating

Anti-reflective coating on inner surface

Inner

Lume

LumiBrite on hands, index(es) and bezel

None

Movement

3 specs

Caliber

6R54

Miyota 6S21

Power Reserve

72h

40h

Jewels

Pricing

1 specs

MSRP

$1,500

$299

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