Side by side

Bremont Altitude Perpetual Calendar GMTvsBaltic Hermétique Summer

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
Hermétique Summer
BalticHermétique Summer
MSRP $594

At a glance

13 of 29 specs differ
Diameter
Altitude Perpetual Calendar GMT42mm
Hermétique Summer37mm
Power Reserve
Altitude Perpetual Calendar GMT40h
Hermétique Summer42h
Water Resistance
Altitude Perpetual Calendar GMT
Hermétique Summer150m
MSRP
Altitude Perpetual Calendar GMT$38,450
Hermétique Summer$594

Full specifications

Case

7 specs
Category
GMT
Dress
Diameter
42mm
37mm
Thickness
12.65mm
10.8mm
Lug-to-Lug
46mm
Lug Width
22mm
20mm
Material
Titanium
Stainless Steel
Water Resistance
150m

Crystal & Dial

3 specs
AR Coating
Inner
Yes
Dial Color
Blue
Orange
Lume
None
BGW9

Movement

2 specs
Caliber
Miyota 9039
Power Reserve
40h
42h

Pricing

1 specs
MSRP
$38,450
$594

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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.

Baltic Hermétique Summer

Reviewers highlight the Baltic Hermétique Summer's compact 37mm brushed case with a polished bezel and 150 meters of water resistance. The watch features glossy dials in bright colors with raised BGW9 Super-LumiNova indices that emit a strong blue glow, and it comes with color-matched FKM rubber straps or Baltic bracelets. The Miyota 9039 movement supports hacking and hand-winding. However, the recessed crown can be difficult to manipulate if fingernails are not long enough, and the movement has a stated accuracy of -10/+30 seconds per day. Overall, reviewers praise the Baltic Hermétique Summer for its well-balanced, colorful dials and strong lume at an affordable price point.

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