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Introducing – Grand Seiko Brings its Calibre 9SA5 in Steel, With the SLGH003


While it has never been a secret that Grand Seiko was capable of crafting some of the finest and most precise luxury watches – pieces that are clearly on par with the best Swiss manufacturers – the concept of innovation at GS is less widely known. Recently, the brand unveiled a concept movement, the T0 Tourbillon Constant Force, a proper demonstration of savoir-faire. Also, Grand Seiko unveiled its Calibre 9SA5, which was packed with innovations regarding its unprecedented escapement. First unveiled in gold, this powerful engine now comes in a stainless steel limited edition, with the new SLGH003.

While the SLGH002 was certainly a highly attractive watch, not only it came in a highly limited run of 100 watches only, but it was also far from accessible, being encased in 18k gold and priced at EUR 45,000. We knew back then that this watch was there as a showcase piece, in order to announce the brand’s new calibre, the Hi-Beat automatic 9SA5, with a revolutionary geometry for its escapement, which represents a whole new generation of Grand Seiko mechanical movements. Today, the brand unveils this engine in a far more accessible piece, now cased in steel.

This new SLGH003 is not differing much from its gold counterpart in terms of design, as the case reutilizes the same proportions and shapes. As such, we find back the 40mm diameter and reasonable 11.7mm thickness, as well as a new overall design with a vertically brushed bezel, curved casebands and greatly designed lugs with an alternation of brushed accents and (Zaratsu) polished facets. This watch is part of the Heritage collection, meaning that it both reflects the past of Grand Seiko as well as being sportier, hence why it is worn on a steel bracelet. The latter is equipped with a folding clasp, with a gold insert.

The dial of this new SLGH003 is also identical to its gold predecessor regarding the hands and indexes, which brought a new design for GS. These are slightly bolder than usual and have a triangular profile, with a central recessed line. The dial is sunray-brushed and executed in Grand Seiko blue, the colour of all watches in the 60th-anniversary collection. It features coloured accents; gold for the logo; red for the seconds hand.

Where the Grand Seiko 60th Anniversary Limited Edition SLGH003 truly makes the difference with other, already well-powered GS models, is on the movement’s side. Equipped with the new calibre 9SA5, the brand introduced a brand new geometry for the escapement, named Dual Impulse, which differs from what’s in use in the classic lever escapement. As you can see, the escape wheel has a star shape with 8 arms, instead of a wheel with teeth.

The main concept behind this Grand Seiko Dual Impulse Escapement is that the locking and impulse functions are dissociated – a solution similar to the Audemars Piguet or the Omega Co-Axial escapements, for example. In one direction, power is transmitted directly to the balance (clockwise), as the roller receives impulse directly on its jewel. In the other direction, it receives an indirect impulse via the pallet fork, as in a traditional escapement. Thanks to this dissociation of the locking and impulse functions, with friction occurring in only one direction, the escapement is more efficient (less friction means less energy required) and more wear-resistant. Calibre 9SA5’s new escapement works in conjunction with a new free-sprung balance that is more resistant to shock and friction and retains its precision for longer periods.

This innovative escapement is used in a movement that is also entirely new, with a slimmer profile (5.18mm), more power storage (two barrels for 80h), equipped with a transversal bridge (for more resistance), with high-frequency (5Hz or 36,000vph), resulting in an accuracy of +5 to -3 seconds per day. The movement itself is also very pleasantly shaped and designed, with more appeal and superior decoration – bridges are nicely curved with polished bevels on the edges and more subtle wave-patterns on the flat surfaces.

Availability and price

The Grand Seiko 60th Anniversary Limited Edition SLGH003 with Calibre 9SA5 will be a limited edition of 1,000 pieces. it will be available at Grand Seiko Boutiques and selected retailers worldwide as of December 2020 and priced at EUR 10,000.

More details at

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