Which is cheaper, the Mark Time Watches M 6 or the Seiko Prospex Sea?

At MSRP the Mark Time Watches M 6 is the cheaper of the two at $495, against $595 for the Seiko Prospex Sea — a $100 gap before any retailer discounting.

Which is bigger, the Mark Time Watches M 6 or the Seiko Prospex Sea?

The Seiko Prospex Sea wears larger at 41.7mm versus 39mm for the Mark Time Watches M 6 — a 2.7mm difference across the dial.

Which has better water resistance, the Mark Time Watches M 6 or the Seiko Prospex Sea?

The Seiko Prospex Sea is rated to 200m versus 100m for the Mark Time Watches M 6.

What movement does the Mark Time Watches M 6 run compared to the Seiko Prospex Sea?

Both watches run automatic movements — the Mark Time Watches M 6 uses the Miyota 9039 and the Seiko Prospex Sea uses the 4R35.

Side by side

Mark Time Watches M 6vsSeiko Prospex Sea

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

Add a watch

Mark Time Watches M 6

m-6

MSRP $495

Seiko Prospex Sea

srpl11

MSRP $595

Buy from Mark Time Watches ↗

Buy used on eBay ↗

Buy from Seiko ↗

Buy used on eBay ↗

At a glance

12 of 29 specs differ

Diameter

M 639mm

Prospex Sea41.7mm

Power Reserve

M 6—

Prospex Sea41h

Water Resistance

M 6100m

Prospex Sea200m

MSRP

M 6$495

Prospex Sea$595

Full specifications

Case

5 specs

Crystal & Dial

3 specs

Crystal

Sapphire

Hardlex

Dial Color

—

Black

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

Miyota 9039

4R35

Power Reserve

—

41h

Jewels

Pricing

1 specs

MSRP

$495

$595

Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Alexander James Watchesmicro

Follow this matchup

Get a note when Mark Time Watches M 6 vs Seiko Prospex Sea gets more votes, a community discussion, or a price drop. No account needed.

Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.

Alexander James Watches A3 Artisan SeriesvsSeiko Prospex Sea Beaucroft Watches PenfoldvsSeiko Prospex Sea Naga Watches OperavsSeiko Prospex Sea Beaucroft Watches ElementvsSeiko Prospex Sea Mark Time Watches M 6vsBorealis Watch Co. Jamanta Dryden PathfindervsMark Time Watches M 6

Edit this comparison Add another watch Explore more 38–43mm watches

Mark Time Watches M 6vsSeiko Prospex Sea

At a glance

Full specifications

More watches worth a look

A3 Artisan Series

Jamanta

Penfold

Pathfinder

Opera

Blacktip 41

Element

Porto Covo

Follow this matchup

People also compared