Premium Japanese mechanical with manual winding, accuracy +/- 5 seconds per day
 Steel case with a diameter of 37.3 mm
 "Boshu" refers to the change of seasons from autumn to winter. The trees in the mountains are beautifully colored and it's finally time to prepare for winter. The color of the trees gradually changed to a deep one, and the deep color of autumn was expressed in the color of the dark wine-red dial.