Which is cheaper, the Bremont Altitude 39 Date or the Seiko Prospex Sea 1965 Heritage Diver's Watch?

At MSRP the Seiko Prospex Sea 1965 Heritage Diver's Watch is the cheaper of the two at $1,300, against $4,250 for the Bremont Altitude 39 Date — a $2,950 gap before any retailer discounting.

Which is bigger, the Bremont Altitude 39 Date or the Seiko Prospex Sea 1965 Heritage Diver's Watch?

The Seiko Prospex Sea 1965 Heritage Diver's Watch wears larger at 40mm versus 39mm for the Bremont Altitude 39 Date — a 1mm difference across the dial.

Which has better water resistance, the Bremont Altitude 39 Date or the Seiko Prospex Sea 1965 Heritage Diver's Watch?

The Seiko Prospex Sea 1965 Heritage Diver's Watch 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 1965 Heritage Diver's Watch?

The Seiko Prospex Sea 1965 Heritage Diver's Watch 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 1965 Heritage Diver's Watch?

Both watches run automatic movements — the Bremont Altitude 39 Date uses the BE-92AE and the Seiko Prospex Sea 1965 Heritage Diver's Watch uses the 6R55.

Side by side

Bremont Altitude 39 DatevsSeiko Prospex Sea 1965 Heritage Diver's Watch

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 1965 Heritage Diver's Watch

spb451j1

MSRP $1,300

At a glance

14 of 29 specs differ

Diameter

Altitude 39 Date39mm

Prospex Sea 1965 Heritage Diver's Watch40mm

Power Reserve

Altitude 39 Date40h

Prospex Sea 1965 Heritage Diver's Watch72h

Water Resistance

Altitude 39 Date100m

Prospex Sea 1965 Heritage Diver's Watch300m

MSRP

Altitude 39 Date$4,250

Prospex Sea 1965 Heritage Diver's Watch$1,300

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

6R55

Power Reserve

40h

72h

Jewels

Pricing

1 specs

MSRP

$4,250

$1,300

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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 1965 Heritage Diver's Watch

The Seiko Prospex Sea 1965 Heritage Diver's Watch is praised for its refined engineering and updated features, including a 300m water resistance and a 72-hour power reserve from the Caliber 6R55 movement in a 40mm case. Owners note its better build quality and interesting finishing with a mix of polished and brushed surfaces. The "Tranquil Teal" variant features a jewel-toned dial with a rippling-water pattern. However, some owners consider the price too high, and concerns exist regarding the accuracy of the 6R movements, with some reporting theirs run slow. One review notes a reflective dial that impacts legibility. On balance, owners and reviewers appreciate the Seiko Prospex Sea 1965 Heritage Diver's Watch for its refined design and improved specifications over previous generations, despite some reservations about movement accuracy and price.

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