Which is cheaper, the Seiko Prospex SPEEDTIMER Mechanical or the Spinnaker Spence 300?

At MSRP the Spinnaker Spence 300 is the cheaper of the two at $650, against $995 for the Seiko Prospex SPEEDTIMER Mechanical — a $345 gap before any retailer discounting.

Which is bigger, the Seiko Prospex SPEEDTIMER Mechanical or the Spinnaker Spence 300?

The Spinnaker Spence 300 wears larger at 40mm versus 39.5mm for the Seiko Prospex SPEEDTIMER Mechanical — a 0.5mm difference across the dial.

Which has better water resistance, the Seiko Prospex SPEEDTIMER Mechanical or the Spinnaker Spence 300?

The Spinnaker Spence 300 is rated to 300m versus 20m for the Seiko Prospex SPEEDTIMER Mechanical.

Which has a longer power reserve, the Seiko Prospex SPEEDTIMER Mechanical or the Spinnaker Spence 300?

The Seiko Prospex SPEEDTIMER Mechanical carries a 72-hour power reserve against 40 hours on the Spinnaker Spence 300.

What movement does the Seiko Prospex SPEEDTIMER Mechanical run compared to the Spinnaker Spence 300?

Both watches run automatic movements — the Seiko Prospex SPEEDTIMER Mechanical uses the 6R55 and the Spinnaker Spence 300 uses the SII NH35A.

Side by side

Seiko Prospex SPEEDTIMER MechanicalvsSpinnaker Spence 300

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

Seiko Prospex SPEEDTIMER Mechanical

spb513j1

MSRP $995

Spinnaker Spence 300

spence-300-automatic-aquamarine-sp-5097-aa

MSRP $650

At a glance

14 of 29 specs differ

Diameter

Prospex SPEEDTIMER Mechanical39.5mm

Spence 30040mm

Power Reserve

Prospex SPEEDTIMER Mechanical72h

Spence 30040h

Water Resistance

Prospex SPEEDTIMER Mechanical200m

Spence 300300m

MSRP

Prospex SPEEDTIMER Mechanical$995

Spence 300$650

Full specifications

Case

6 specs

Crystal & Dial

4 specs

Crystal Shape

Curved

Flat

AR Coating

Anti-reflective coating on inner surface

Inner

Dial Color

Black

Aquamarine

Lume

LumiBrite on hands and index(es)

None

Movement

3 specs

Caliber

6R55

SII NH35A

Power Reserve

72h

40h

Jewels

Pricing

1 specs

MSRP

$995

$650

Follow this matchup

Get a note when Seiko Prospex SPEEDTIMER Mechanical vs Spinnaker Spence 300 gets more votes, a community discussion, or a price drop. No account needed.

What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Seiko Prospex SPEEDTIMER Mechanical

The Seiko Prospex SPEEDTIMER Mechanical is praised for its visually appealing design and comfortable wearability, with owners frequently using its chronograph function for daily tasks. Reviewers note its clean dial layout and LumiBrite treated hands and markers, and one source highlights the 72-hour power reserve of the 6R55 movement. However, some owners criticize its chronograph functionality and the 24-hour subdial. On balance, owners and reviewers rate the Seiko Prospex SPEEDTIMER Mechanical highly for its daily usability and refined aesthetics.

Time + Tide

Monochrome

Spinnaker Spence 300

The Spinnaker Spence 300 is widely praised for its slim 10.9mm case and 40mm diameter, offering a comfortable and uncommon thin diver design at its price point. Reviewers and owners highlight its value, especially below $350, and its blend of retro design with modern specifications, including a 300m depth rating and a fully indexed bezel. Some owners, however, find the dial printing and bracelet finishing to be less refined, with one noting the bracelet's male end links as a drawback. The consensus is that the Spinnaker Spence 300 is highly regarded for its exceptional value and wearable dimensions, making it a strong contender for an everyday sports watch.

Fratello

WatchUSeek

Keep exploring