Seiko Prospex SPEEDTIMER solar men's watch 2023.7 SBER001 SFJ001Product Highlights Equipped with the newly developed Cal. 8A50, the most precise measurement accuracy in the history of the new SPEEDTIMER, capable of measuring up to 1 100th of a second. By separating the time display and stopwatch display, Seiko pursues "visibility" and "readability" as a measuring instrument. The design embodies Seiko's design philosophy of pursuing "accurately measuring time" by adopting buttons with a hammer shape that consider