Hamilton Jazzmaster AutovsKARL-LEIMON Open Heart

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Measurements

Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Hamilton Jazzmaster Auto at true scale

Jazzmaster Auto

KARL-LEIMON Open Heart at true scale

Open Heart

Diameter

36mm

40mm

Thickness

10mm

9.8mm

lowest

Water Resistance

50m

50m

Power Reserve

80h

n/a

MSRP

$1,125

$685

lowest

Movement

Hamilton H-10

Miyota 9029

Case

4 specs
Category
Dress
n/a
Diameter
36mm
40mm
Thickness
10mm
9.8mm
Lug Width
18mm
20mm

Crystal & Dial

1 specs
Dial Color
Black
n/a

Movement

2 specs
Caliber
Hamilton H-10
Miyota 9029
Power Reserve
80h
0h

Pricing

1 specs
MSRP
$1,125
$685
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Reviews

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Hamilton Jazzmaster Auto

The Hamilton Jazzmaster Auto is widely praised for its clean, uncomplicated design, making it suitable for both work and casual wear. Owners appreciate its value, calling it a gorgeous watch with a good bang for the buck. The 36mm case wears easily and unobtrusively, offering a reliable and straightforward option. Reviewers note its balance of contemporary style and traditional watchmaking. The Hamilton Jazzmaster Auto features an automatic Hamilton H-10 movement and 5 bar water resistance. Overall, owners and reviewers rate the Hamilton Jazzmaster Auto highly for its versatile design and excellent value at its price point.

KARL-LEIMON Open Heart

The KARL-LEIMON Open Heart is widely praised for its slim 9.8mm case and excellent finishing, presented in a wearable 40mm size with a coherent integrated bracelet design. Owners report the quality exceeds expectations, with strap versatility leading to frequent wear. The watch utilizes a Miyota 9029 automatic movement and features a sapphire crystal. It is available at an accessible $595 price point. However, some reviewers find the exposed balance wheel perplexing, and one owner advises against purchasing due to nonexistent customer service and shipping issues. Overall, owners and reviewers rate the KARL-LEIMON Open Heart highly for its impressive case finishing and wearability at its price point.