Hamilton Jazzmaster Power Reserve AutovsYema Superman Worldtime GMT
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
9 of 29 specs differFull specifications
Case
6 specsCrystal & Dial
1 specsMovement
1 specsPricing
1 specsFollow this matchup
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Owners + reviewers, side by side
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
The Hamilton Jazzmaster Power Reserve Auto is praised by owners and reviewers for its value and history, featuring an 80-hour power reserve caliber H-13 movement. Owners note poor lume, easily scratched polished bezels, and a mineral crystal on the movement display. One owner suggests the 80-hour power reserve is difficult to achieve without manual winding. On balance, owners and reviewers rate the Hamilton Jazzmaster Power Reserve Auto well for its value and history, despite noted drawbacks in finishing and crystal material.
Owners widely praise the Yema Superman Worldtime GMT for its premium feel, unique bezel-lock mechanism, and attractive domed crystal. Some owners note the aluminum bezel insert is less desirable than ceramic and report the bracelet clasp can be stiff or difficult to open. Inconsistent quality control and poor customer service have been flagged by some owners. On balance, owners value the Yema Superman Worldtime GMT for its distinctive features and comfortable wearability.
The "Coke" bezel and maxi dial are attractive design elements. The in-house automatic GMT movement is a French alternative to pricier GMTs.
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