Which is cheaper, the Seiko Prospex SPEEDTIMER or the Zero West M1 Series?

At MSRP the Seiko Prospex SPEEDTIMER is the cheaper of the two at $3,000, against $3,600 for the Zero West M1 Series — a $600 gap before any retailer discounting.

Which is bigger, the Seiko Prospex SPEEDTIMER or the Zero West M1 Series?

The Seiko Prospex SPEEDTIMER wears larger at 42.5mm versus 41mm for the Zero West M1 Series — a 1.5mm difference across the dial.

Which has better water resistance, the Seiko Prospex SPEEDTIMER or the Zero West M1 Series?

The Zero West M1 Series is rated to 100m versus 10m for the Seiko Prospex SPEEDTIMER.

Which has a longer power reserve, the Seiko Prospex SPEEDTIMER or the Zero West M1 Series?

The Seiko Prospex SPEEDTIMER carries a 45-hour power reserve against 41 hours on the Zero West M1 Series.

What movement does the Seiko Prospex SPEEDTIMER run compared to the Zero West M1 Series?

Both watches run automatic movements — the Seiko Prospex SPEEDTIMER uses the Seiko 8R46 and the Zero West M1 Series uses the Sellita SW200-1.

Side by side

Seiko Prospex SPEEDTIMERvsZero West M1 Series

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

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Seiko Prospex SPEEDTIMER

MSRP $3,000

See the full Prospex SPEEDTIMER

Zero West M1 Series

m1-blackout-41mm

MSRP $3,600

See the full M1 Series

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At a glance

13 of 29 specs differ

Diameter

Prospex SPEEDTIMER42.5mm

M1 Series41mm

Power Reserve

Prospex SPEEDTIMER45h

M1 Series41h

Water Resistance

Prospex SPEEDTIMER100m

M1 Series100m

MSRP

Prospex SPEEDTIMER$3,000

M1 Series$3,600

Full specifications

Case

5 specs

Crystal & Dial

4 specs

Crystal Shape

Curved

—

AR Coating

Anti-reflective coating on inner surface

—

Dial Color

—

Lume

LumiBrite on hands and index(es)

None

Movement

3 specs

Caliber

Seiko 8R46

Sellita SW200-1

Power Reserve

45h

41h

Jewels

Pricing

1 specs

MSRP

$3,000

$3,600

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Seiko Prospex SPEEDTIMERvsZero West M1 Series

At a glance

Full specifications

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