Side by side

Bremont Altitude Perpetual Calendar GMTvsSeiko Prospex LX line

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

Altitude Perpetual Calendar GMT
BremontAltitude Perpetual Calendar GMT
MSRP $38,450
Prospex LX line
SeikoProspex LX line
MSRP $5,500

At a glance

12 of 29 specs differ
Diameter
Altitude Perpetual Calendar GMT42mm
Prospex LX line44.8mm
Power Reserve
Altitude Perpetual Calendar GMT40h
Prospex LX line72h
Water Resistance
Altitude Perpetual Calendar GMT
Prospex LX line200m
MSRP
Altitude Perpetual Calendar GMT$38,450
Prospex LX line$5,500

Full specifications

Case

4 specs
Diameter
42mm
44.8mm
Thickness
12.65mm
14.7mm
Lug-to-Lug
50.9mm
Water Resistance
200m

Crystal & Dial

3 specs
AR Coating
Inner
Super-clear coating
Dial Color
Blue
Black
Lume
None
LumiBrite on hands and index(es)

Movement

4 specs
Caliber
5R66
Type
Automatic
Spring Drive
Power Reserve
40h
72h
Jewels
25
30

Pricing

1 specs
MSRP
$38,450
$5,500

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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 Perpetual Calendar GMT

The Bremont Altitude Perpetual Calendar GMT is a highly exclusive piece, with one owner noting its $44,000 price point raises questions about its target audience and suggesting it may be a limited production showpiece. Reviewers highlight its refined Trip-Tick case, now featuring softer curves, a 42mm diameter, and a 12.23mm thickness in grade 2 titanium, though the oversized crowns are flagged as a potential drawback. Overall, owners and reviewers acknowledge the Bremont Altitude Perpetual Calendar GMT as a distinctive, albeit niche, high-complication offering with a notable case refinement.

Seiko Prospex LX line

Owners widely report the dial's blue-green sunburst is phenomenal, and the sapphire glass features blue AR coating. Some owners feel the high price limits discounts and sales, with one AD noting extremely low sales due to the cost. One owner reported DLC peeling off a two-week-old watch, and another noted quality control issues like bezel inserts and fallen second hands. On balance, owners consider the Seiko Prospex LX line a nicely built watch, though pricing led to poor sales and its discontinuation.

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