Which is cheaper, the Bremont Altitude Chronograph or the Seiko Prospex Sea?

At MSRP the Seiko Prospex Sea is the cheaper of the two at $1,500, against $6,300 for the Bremont Altitude Chronograph — a $4,800 gap before any retailer discounting.

Which is bigger, the Bremont Altitude Chronograph or the Seiko Prospex Sea?

The Seiko Prospex Sea wears larger at 43.5mm versus 42mm for the Bremont Altitude Chronograph — a 1.5mm difference across the dial.

Which has better water resistance, the Bremont Altitude Chronograph or the Seiko Prospex Sea?

The Seiko Prospex Sea is rated to 200m versus 100m for the Bremont Altitude Chronograph.

Which has a longer power reserve, the Bremont Altitude Chronograph or the Seiko Prospex Sea?

The Seiko Prospex Sea carries a 70-hour power reserve against 40 hours on the Bremont Altitude Chronograph.

What movement does the Bremont Altitude Chronograph run compared to the Seiko Prospex Sea?

Both watches run automatic movements — the Bremont Altitude Chronograph uses the BE-50AE and the Seiko Prospex Sea uses the 6R35.

Side by side

Bremont Altitude ChronographvsSeiko Prospex Sea

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

Bremont Altitude Chronograph

alt42-chr-g-ss-si-l-s

MSRP $6,300

Seiko Prospex Sea

spb349j1

MSRP $1,500

At a glance

14 of 29 specs differ

Diameter

Altitude Chronograph42mm

Prospex Sea43.5mm

Power Reserve

Altitude Chronograph40h

Prospex Sea70h

Water Resistance

Altitude Chronograph100m

Prospex Sea200m

MSRP

Altitude Chronograph$6,300

Prospex Sea$1,500

Full specifications

Case

7 specs

Crystal & Dial

3 specs

AR Coating

Inner

Anti-reflective coating on inner surface

Dial Color

Silver

Black

Lume

None

LumiBrite on hands and index(es)

Movement

3 specs

Caliber

BE-50AE

6R35

Power Reserve

40h

70h

Jewels

Pricing

1 specs

MSRP

$6,300

$1,500

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What people say

Owners + reviewers, side by side

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

Bremont Altitude Chronograph

Owners note faint marks on the case sides and back, with minor wear and creasing on the strap. Reviewers flag the "DANGER EJECTION SEAT" wordmark on the dial as a divisive design choice that disrupts the MB series' usual stark tone, though they praise the improved smoothness and click precision of the Roto Click rotating bezel. On balance, the Bremont Altitude Chronograph elicits mixed reactions, with design elements like the dial text being a point of contention for reviewers.

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Seiko Prospex Sea

Seiko Prospex Sea owners and reviewers praise its Marinemaster-style aesthetic, excellent case finishing, and impressive LumiBrite lume. The watch is powered by the 6R15 movement with a 50-hour power reserve and comes with both a steel bracelet and a silicone strap. Some owners find the Seiko Prospex Sea to be a great value and a suitable first "proper" watch, while others report it is uncomfortably big, thick, and heavy on smaller wrists. Reviewers note the GMT function is secondary with a less prominent scale, and the bezel's quieter clicks may not appeal to all. On balance, owners and reviewers rate the Seiko Prospex Sea highly for its classic design and finishing at its price point.

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