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.

Jazzmaster Auto

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 specsCrystal & Dial
1 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
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.
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.
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