The recent requests for the Spring Drive movement have many enthusiasts looking at the hard-to-find Grand Seiko line because of the newly released Hi-Beat SBGH001 and SBGH003 watches with the new 36,000 Beats Per Hour (BPH) 9S85 caliber. The caliber 9S85 is a state of the art mechanical movement, with accuracy of +5/-1 seconds per day, the GS Hi-Beat is arguably the most accurate mechanical wristwatch in production today.Worried about the typical 36,000 BPH fall backs like increased servicing requirements and a need for a stable power flow through the gear train? It has been addressed by Seiko and improved the mainspring and the design of the escapement wheel.
The mainspring was developed for the Springdrive but tweaked the mainspring dimensions to deliver a more consistent band of power throughout the 9S85’s 55hr power reserve.
The lubrication issue also was addressed by a newly developed micro machining method, which improved polishing and hardening of the escape wheel teeth, and a honeycomb-like design within the wheel which improves long term stability in the escapement.
The traditional Grand Seiko design includes the dauphine hands, solid oyster divers bracelet and a traditionally designed 40mm case. Both satin and bright finishes are carried throughout the case and bracelet.
Reference#: SBGH001 and SBGH003
Case: 40mm Stainless Steel with brushed finish and bright finishes
Complications: High Beat, 55 Hour Power Reserve
Movements: Seiko Caliber 9S85 self-winding automatic high beat movement
Dial: White with hand applied sticks or Green with applied sticks
Bracelet: Stainless Steel Oyster Divers bracelet
Water Resistance: 10m
Crystal: Anti-reflective Sapphire
Estimated Price: $5,500.00
[source SeiyaJapan.com]
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