831 Mechanical NB6051-59L ￥159,500 (Tax excluded: ￥145,000) Limited Edition: 1,800 pieces worldwide Like new condition, only tried on indoors. All extra links and accessories included. 831 Mechanical Limited Model With the design theme of "the beautiful sea shimmering in the sunlight," the dial features an ice blue color that evokes the clear sea, and a geometric pattern represents the water surface shimmering with the refraction of light. This is a special specification unique to the limited model. The see-through back allows you to feel the heartbeat of the movement. It also has the Series Eight's basic performance of "dual magnetic resistance" to prevent time deviation caused by magnetism.