24. 4. 2021
Ready, Set, Go! – In-Depth with Spring Drive Chronograph Caliber 9R86 and ref. SBGC201
In 2007, Grand Seiko unveiled caliber 9R86, the brand’s first Spring Drive chronograph movement with a GMT function, date, and automatic winding. Today, we look at what makes this movement special, with a focus on one of Grand Seiko’s most important chronograph models – ref. SBGC201.