What movement does the Seiko Prospex SPEEDTIMER Mechanical Datsun 240Z Limited Edition run compared to the Helgray Speedster (Silver Panda)?

Both watches run automatic movements — the Seiko Prospex SPEEDTIMER Mechanical Datsun 240Z Limited Edition uses the 6R55 and the Helgray Speedster (Silver Panda) uses the Miyota 6S21.

Side by side

Seiko Prospex SPEEDTIMER Mechanical Datsun 240Z Limited EditionvsHelgray Speedster (Silver Panda)

Q: Which is cheaper, the Seiko Prospex SPEEDTIMER Mechanical Datsun 240Z Limited Edition or the Helgray Speedster (Silver Panda)?

At MSRP the Helgray Speedster (Silver Panda) is the cheaper of the two at $299, against $1,150 for the Seiko Prospex SPEEDTIMER Mechanical Datsun 240Z Limited Edition — a $851 gap before any retailer discounting.

Q: Which is bigger, the Seiko Prospex SPEEDTIMER Mechanical Datsun 240Z Limited Edition or the Helgray Speedster (Silver Panda)?

The Seiko Prospex SPEEDTIMER Mechanical Datsun 240Z Limited Edition wears larger at 39.5mm versus 39mm for the Helgray Speedster (Silver Panda) — a 0.5mm difference across the dial.

Q: Which has better water resistance, the Seiko Prospex SPEEDTIMER Mechanical Datsun 240Z Limited Edition or the Helgray Speedster (Silver Panda)?

The Helgray Speedster (Silver Panda) is rated to 30m versus 20m for the Seiko Prospex SPEEDTIMER Mechanical Datsun 240Z Limited Edition.

Q: Which has a longer power reserve, the Seiko Prospex SPEEDTIMER Mechanical Datsun 240Z Limited Edition or the Helgray Speedster (Silver Panda)?

The Seiko Prospex SPEEDTIMER Mechanical Datsun 240Z Limited Edition carries a 72-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 SPEEDTIMER Mechanical Datsun 240Z Limited Edition

spb517j1

MSRP $1,150

Helgray Speedster (Silver Panda)

speedster-silver-panda

MSRP $299

At a glance

10 of 29 specs differ

Diameter

Prospex SPEEDTIMER Mechanical Datsun 240Z Limited Edition39.5mm

Speedster (Silver Panda)39mm

Power Reserve

Prospex SPEEDTIMER Mechanical Datsun 240Z Limited Edition72h

Speedster (Silver Panda)40h

Water Resistance

Prospex SPEEDTIMER Mechanical Datsun 240Z Limited Edition200m

Speedster (Silver Panda)30m

MSRP

Prospex SPEEDTIMER Mechanical Datsun 240Z Limited Edition$1,150

Speedster (Silver Panda)$299

Full specifications

Case

3 specs

Diameter

39.5mm

39mm

Lug-to-Lug

44.5mm

46mm

Water Resistance

200m

30m

Crystal & Dial

3 specs

Crystal Shape

Curved

Flat

AR Coating

Anti-reflective coating on inner surface

Inner

Lume

LumiBrite on hands and index(es)

None

Movement

3 specs

Caliber

6R55

Miyota 6S21

Power Reserve

72h

40h

Jewels

Pricing

1 specs

MSRP

$1,150

$299

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