What movement does the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition run compared to the Helgray Speedster (Silver Panda)?

Both watches run automatic movements — the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition uses the 8L35 and the Helgray Speedster (Silver Panda) uses the Miyota 6S21.

Side by side

Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited EditionvsHelgray Speedster (Silver Panda)

Q: Which is cheaper, the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition or the Helgray Speedster (Silver Panda)?

At MSRP the Helgray Speedster (Silver Panda) is the cheaper of the two at $299, against $3,300 for the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition — a $3,001 gap before any retailer discounting.

Q: Which is bigger, the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition or the Helgray Speedster (Silver Panda)?

The Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition wears larger at 44mm versus 39mm for the Helgray Speedster (Silver Panda) — a 5mm difference across the dial.

Q: Which has better water resistance, the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition or the Helgray Speedster (Silver Panda)?

The Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition is rated to 200m versus 30m for the Helgray Speedster (Silver Panda).

Q: Which has a longer power reserve, the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition or the Helgray Speedster (Silver Panda)?

The Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition carries a 50-hour power reserve against 40 hours on the Helgray Speedster (Silver Panda).

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

Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition

sla061j1

MSRP $3,300

Helgray Speedster (Silver Panda)

speedster-silver-panda

MSRP $299

At a glance

12 of 29 specs differ

Diameter

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition44mm

Speedster (Silver Panda)39mm

Power Reserve

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition50h

Speedster (Silver Panda)40h

Water Resistance

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition200m

Speedster (Silver Panda)30m

MSRP

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition$3,300

Speedster (Silver Panda)$299

Full specifications

Case

5 specs

Crystal & Dial

3 specs

Crystal Shape

Curved

Flat

AR Coating

Anti-reflective coating on inner surface

Inner

Lume

LumiBrite on hands, index(es) and bezel

None

Movement

3 specs

Caliber

8L35

Miyota 6S21

Power Reserve

50h

40h

Jewels

Pricing

1 specs

MSRP

$3,300

$299

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