Nearly a decade prior to unveiling their inaugural automatic chronograph, the 6139, Seiko commemorated the Olympic Games in Tokyo by launching two distinctive and specialized timepieces that would leave an indelible mark on Seiko's heritage.
 
The initial creation was the 6217 World Time, while the second stood as a monopusher chronograph, boasting a 60-second timer, famously recognized as the 45899.
 
Rooted in the hand-wound Crown movement, the "Monopusher" signaled the dawn of a groundbreaking era for Seiko. Its chronograph mechanism incorporated the iconic column wheel, orchestrating the engagement with the chronograph wheel horizontally through two coupling wheels via the third wheel. The single pusher elegantly served the dual function of initiating and halting the sweep hand, as well as swiftly resetting it.
 
This "Eternity ring" variant showcases a radiant silver ring encompassing its meticulously crafted AD dial and indexes. Exceptionally rare to come by, its impeccable condition surpasses what photos can truly capture.
 
Ships from Tokyo, Japan.