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 $1,100, against $4,250 for the Bremont Altitude 39 Date — a $3,150 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 41.3mm versus 39mm for the Bremont Altitude 39 Date — a 2.3mm 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 300m 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 72-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 6R55.

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

spb481j1

MSRP $1,100

At a glance

13 of 29 specs differ

Diameter

Altitude 39 Date39mm

Prospex Sea41.3mm

Power Reserve

Altitude 39 Date40h

Prospex Sea72h

Water Resistance

Altitude 39 Date100m

Prospex Sea300m

MSRP

Altitude 39 Date$4,250

Prospex Sea$1,100

Full specifications

Case

6 specs

Crystal & Dial

3 specs

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

6R55

Power Reserve

40h

72h

Jewels

Pricing

1 specs

MSRP

$4,250

$1,100

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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.

Seiko Prospex Sea models are widely praised for their excellent build quality, value for money, and comfortable wearability, with many appreciating the vintage-inspired designs and robust construction. Owners note the silicone straps are surprisingly comfortable and well-finished, and the Lumibrite lume is excellent. However, some find the 44.3mm size and thickness too large for smaller wrists, though others report the sizing as perfect. The 6R15 movement in some variants offers accuracy around +4 seconds per day with a 50-hour power reserve, while newer movements offer more. Some models are criticized for a bracelet width not matching the case size or a rudimentary clasp for their price point. Overall, owners and reviewers rate the Seiko Prospex Sea highly for its impressive case work and finishing at its price point.

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