The Grand Seiko SLGH027: A New Benchmark in Ever-Brilliant Steel

Grand Seiko has introduced a new addition to its Evolution 9 collection with the SLGH027, a 40mm timepiece crafted from Ever-Brilliant steel. This release marks one of the brand’s first for 2025, combining a sophisticated high-beat movement with a meticulously designed dial inspired by Mt. Iwate. 

Design and Inspiration

The SLGH027 continues Grand Seiko’s tradition of drawing inspiration from natural landscapes, particularly Mt. Iwate, one of Japan’s most prominent volcanoes. The watch’s dial pattern is reminiscent of the ridges of the mountain, depicting an aerial view where air and water converge. The result is a striking radial design that enhances the visual depth of the dial.

Case and Bracelet

The watch features a 40mm diameter and an 11.7mm thick case, staying true to the Evolution 9 style. Ever-Brilliant steel, known for its high corrosion resistance, forms both the case and bracelet, offering durability and a refined aesthetic. Grand Seiko’s signature Zaratsu polishing enhances the reflective surfaces, while strong grooved hands and applied indices ensure optimal legibility. 

Movement and Performance

At the heart of the SLGH027 is the Caliber 9SA5, an automatic movement with an impressive 80-hour power reserve. The movement incorporates the Grand Seiko Dual Impulse Escapement, making it one of the few serially produced escapements outside the Swiss lever category. The twin barrels enhance power efficiency, maintaining a high-frequency beat rate of 36,000 vibrations per hour.

Features and Specifications

– Case Material: Ever-Brilliant Steel

– Diameter: 40mm

– Thickness: 11.7mm

– Dial Color: Light blue with a radial pattern

– Indexes: Applied

– Lume: None

– Water Resistance: 100m

– Strap/Bracelet: Ever-Brilliant steel bracelet with a three-fold clasp (including elements in 18k rose gold and titanium)

Movement Details

– Caliber: 9SA5

– Functions: Hours, minutes, seconds, date

– Power Reserve: 80 hours

– Winding Mechanism: Automatic

– Frequency: 36,000 vibrations per hour

– Jewels: 47

– Chronometer Certification: No, but offers precision of +5 to -3 seconds per day

– Case Back: See-through screw case back

Availability and Pricing

The Grand Seiko SLGH027 is set for release in May 2025, with a limited production run of 1,200 pieces. The retail price is $10,500. Given its unique craftsmanship, high-performance movement, and exclusive design, this model aligns with the brand’s commitment to delivering high-end horology.

Conclusion

The Grand Seiko SLGH027 represents a fusion of technical innovation and aesthetic excellence. With its high-beat automatic movement, durable Ever-Brilliant steel construction, and intricately designed dial, it stands as a compelling option for collectors and enthusiasts alike. As Grand Seiko continues to refine its offerings, the SLGH027 exemplifies the brand’s dedication to precision and artistry.

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