Side by side

Hamilton Jazzmaster Open Heart AutovsPraesidus Type H-75

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

Jazzmaster Open Heart Auto
HamiltonJazzmaster Open Heart Auto
MSRP $2,695
Type H-75
PraesidusType H-75
MSRP $245

At a glance

12 of 29 specs differ
Diameter
Jazzmaster Open Heart Auto36mm
Type H-7539mm
Power Reserve
Jazzmaster Open Heart Auto80h
Type H-7540h
Water Resistance
Jazzmaster Open Heart Auto50m
Type H-75100m
MSRP
Jazzmaster Open Heart Auto$2,695
Type H-75$245

Full specifications

Case

7 specs
Category
Chronograph
Pilot
Diameter
36mm
39mm
Thickness
10mm
Lug-to-Lug
46mm
Lug Width
18mm
20mm
Material
Stainless Steel
316L Stainless Steel
Water Resistance
50m
100m

Crystal & Dial

1 specs
Dial Color
Mother of pearl
Black

Movement

3 specs
Caliber
H-10
Seiko VK63 Meca-Quartz
Type
Automatic
Quartz
Power Reserve
80h
40h

Pricing

1 specs
MSRP
$2,695
$245

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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.

Hamilton Jazzmaster Open Heart Auto

The Hamilton Jazzmaster Open Heart Auto is noted for its dressy yet versatile design, featuring striking gradient dials and intricately shaped cutouts that reveal the H-10 movement. It boasts an 80-hour power reserve and Nivachron hairspring. The watch is available in 36mm, 40mm, or 42mm stainless steel cases. On balance, the Hamilton Jazzmaster Open Heart Auto is appreciated for its visually engaging dial and movement display at its price point.

From video reviewers

The smoked dial's precision cutouts offer a captivating view of the automatic movement. Legibility is compromised by the open-heart design.

Praesidus Type H-75

The Praesidus Type H-75 is praised for its mid-century pilot chronograph style and approachable $245 price point, featuring a utilitarian 38mm stainless steel case with a gear-toothed bezel and an attractive aged dial texture with raised Arabic numerals. However, the "sapphire coated" mineral crystal and divisive mustard-yellow lume on brushed hands are noted drawbacks. One reviewer found the oversized crown made daily winding a tactile pleasure. On balance, owners and reviewers rate the Praesidus Type H-75 highly for its successful capture of vintage pilot chronograph aesthetics at an accessible price.

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