Central to this success was a variety of stopwatches that included Seiko’s revolutionary “heart-shaped cam” mechanism, a feature which delivered a level of precision once thought unachievable by manual sports activities timing units. Then, in 1969, Seiko introduced the Seiko Speedtimer with the innovative Caliber 6139. Here we now have a Seiko chronograph that was… Continue reading Why I Bought It: Grand Seiko Seasons Winter Taisetsu Sbga415