Formex Essence FortyOnevsGrand Seiko SLGH017
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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.

Essence FortyOne

SLGH017
Diameter
41mm
40mm
Lug-to-Lug
46.5mm
lowest
47mm
Thickness
10.6mm
lowest
11.7mm
Water Resistance
100m
100m
Power Reserve
41h
80h
highest
MSRP
$1,890
lowest
$10,500
Movement
Sellita SW200-1
Grand Seiko 9SA5
Case
4 specsCrystal & Dial
3 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners and reviewers widely praise the Formex Essence FortyOne for its excellent bracelet comfort and quality, often considered best in its price class, along with good finishing and slim wearability. The watch is seen as a compelling value, offering a sporty-chic aesthetic and build quality that punches above its weight. Some owners dislike the brand name and logo, and the bolts around the dial are polarizing. A point of contention for some is the non-screw-down crown, raising concerns about swimming, despite its 100m water resistance rating. Overall, owners and reviewers rate the Formex Essence FortyOne highly for its exceptional bracelet comfort and finishing at its price point.
The COSC-certified automatic movement is a shared strength. Reviewers did not agree on any weaknesses.
Grand Seiko SLGH017 owners and reviewers widely praise its impeccable finishing on applied markers and handset, the mesmerizing "Night Birch" dial that comes alive under light, and the lightweight titanium construction. The high-beat 9SA5 movement is also noted as beautiful, with one owner reporting approximately 80 hours power reserve and accuracy within spec at +4 sec/day, while another saw +5 to -3 seconds per day. However, some find the SLGH017 appears thick or wide, and a few prefer the classic case design and dial of other models. Concerns are raised about the handset's proportions and the lack of lume, with some owners reporting accuracy issues with the 9SA5 movement. On balance, owners and reviewers rate the Grand Seiko SLGH017 highly for its stunning dial and finishing, despite some reservations about its case proportions and lume.
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