Side by side

Hamilton Jazzmaster Open Heart AutovsPraesidus Neptune 44

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
Neptune 44
PraesidusNeptune 44
MSRP $550

At a glance

12 of 29 specs differ
Diameter
Jazzmaster Open Heart Auto36mm
Neptune 4444mm
Power Reserve
Jazzmaster Open Heart Auto80h
Neptune 4440h
Water Resistance
Jazzmaster Open Heart Auto50m
Neptune 44200m
MSRP
Jazzmaster Open Heart Auto$2,695
Neptune 44$550

Full specifications

Case

7 specs
Category
Chronograph
Diver
Diameter
36mm
44mm
Thickness
10mm
Lug-to-Lug
46mm
Lug Width
18mm
22mm
Material
Stainless Steel
316L Stainless Steel
Water Resistance
50m
200m

Crystal & Dial

2 specs
Crystal
Sapphire
Domed Sapphire
Dial Color
Mother of pearl
Patina

Movement

2 specs
Caliber
H-10
Miyota 9039
Power Reserve
80h
40h

Pricing

1 specs
MSRP
$2,695
$550

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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 Neptune 44

The dial details and historical elements, including fragments from Iwo Jima battlefield relics, are praised. The bracelet exhibits rattle. Reviewers disagree on the use of faux patina on the dial.

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