Which is cheaper, the Bremont Altitude 39 Date or the Seiko Prospex Sea?

At MSRP the Seiko Prospex Sea is the cheaper of the two at $900, against $4,250 for the Bremont Altitude 39 Date — a $3,350 gap before any retailer discounting.

Which is bigger, the Bremont Altitude 39 Date or the Seiko Prospex Sea?

The Seiko Prospex Sea wears larger at 41mm versus 39mm for the Bremont Altitude 39 Date — a 2mm difference across the dial.

Which has better water resistance, the Bremont Altitude 39 Date or the Seiko Prospex Sea?

The Seiko Prospex Sea is rated to 200m versus 100m for the Bremont Altitude 39 Date.

Which has a longer power reserve, the Bremont Altitude 39 Date or the Seiko Prospex Sea?

The Seiko Prospex Sea carries a 70-hour power reserve against 40 hours on the Bremont Altitude 39 Date.

What movement does the Bremont Altitude 39 Date run compared to the Seiko Prospex Sea?

Both watches run automatic movements — the Bremont Altitude 39 Date uses the BE-92AE and the Seiko Prospex Sea uses the 6R35.

Side by side

Bremont Altitude 39 DatevsSeiko Prospex Sea

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

Bremont Altitude 39 Date

alt39-dt-ss-si-l-s

MSRP $4,250

Seiko Prospex Sea

spb317j1

MSRP $900

At a glance

14 of 29 specs differ

Diameter

Altitude 39 Date39mm

Prospex Sea41mm

Power Reserve

Altitude 39 Date40h

Prospex Sea70h

Water Resistance

Altitude 39 Date100m

Prospex Sea200m

MSRP

Altitude 39 Date$4,250

Prospex Sea$900

Full specifications

Case

6 specs

Crystal & Dial

4 specs

Crystal Shape

Flat

Curved

AR Coating

Inner

Anti-reflective coating on inner surface

Dial Color

Silver

Black

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

BE-92AE

6R35

Power Reserve

40h

70h

Jewels

Pricing

1 specs

MSRP

$4,250

$900

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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 39 Date

Owners and reviewers widely praise the Bremont Altitude 39 Date as a sleek, legible, and everyday-suited pilot's watch, noting its comfortable 39mm 904L steel case and clean dial design. The La Joux-Perret G100 movement is recognized for its 68-hour power reserve and smooth winding feel. Some owners note the bracelet lacks micro-adjustments. On balance, the consensus is that the Bremont Altitude 39 Date is highly regarded for its refined finishing and wearability at 39mm.

Owners widely praise the Seiko Prospex Sea for its excellent lume, robust build, and value, with many highlighting the comfortable 4 o'clock crown and reliable movements. Reviewers note impressive case finishing and attractive dials, with specific models lauded for their gradient blue designs and smooth bezel actions. Accuracy figures vary, with one owner reporting +9 seconds/day after demagnetization, while others find the watches to be good first "proper" watches. Some owners find the stock rubber straps uncomfortable or the overall size substantial on smaller wrists. On balance, owners and reviewers rate the Seiko Prospex Sea highly for its combination of strong dive watch functionality and appealing design at its price point.

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