The newest Alpinist Sharks Tooth Black Ref. SBDC087/SPB117J1 joins the pioneers (along with the new Sumos and Presage) to have a new movement; powered by Seiko’s latest automatic caliber, 6R35, which is an upgrade from the workhorse 6R15. It still operates at 21,600 BPH (3 Hertz) with hacking and hand winding capabilities. Its main updates are the increase of jewels to 24 and a power reserve of 70 hours from 50 hours on previous versions. All of it can be seen through its open case-back.