Casio EFB-730DvsUndone Mystique Neptune
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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.

EFB-730D

Mystique Neptune
Diameter
40mm
40mm
Lug-to-Lug
47mm
n/a
Thickness
11mm
n/a
Water Resistance
100m
highest
30m
MSRP
$165
lowest
$265
Movement
Quartz
Seiko VK61
Case
5 specsCrystal & Dial
3 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Casio EFB-730D for its 40mm size, which is considered perfect for smaller to medium wrists and versatile for strap changes with its 20mm lug width. The subtle sunburst blue dial is noted as classy and better in person than in photos, and the overall finish is considered quite good for the price. Some owners find the constantly running central seconds hand impractical, while others appreciate its straightforward Casio quartz reliability and value around $150. One owner reported the second hand sticking on the minute hand, and another found the 47mm lug-to-lug measurement wore larger than expected. Overall, owners rate the Casio EFB-730D highly for its comfortable wearability and attractive design at the price point.
The Undone Mystique Neptune is widely praised for its eye-catching and sophisticated smoked dials, which reviewers note are achieved through a painted rather than printed technique, offering remarkable dial sophistication for its price point. Owners consistently find the dial appearance superior in person to photographs. The watch utilizes a Seiko VK61 meca-quartz movement, providing the convenience of quartz with mechanical chronograph functionality. One owner finds the 40mm case size too large for their preference, despite the dial being spectacular. Overall, owners and reviewers highly regard the Undone Mystique Neptune for its exceptional dial finishing and sophisticated appearance at an accessible price.
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