The Seiko Prospex SPB337J1, also known as the 'Black Series Night' Alpinist, is a limited edition timepiece with only 5,500 pieces available. Inspired by night diving missions, it features a 39.5mm stainless steel case with a black hard coating and a black dial. The hands and markers are treated with Seiko’s 'Green LumiBrite Pro' for enhanced visibility in low-light conditions. Powered by the in-house Caliber 6R35 automatic movement, it offers a 70-hour power reserve. The watch is water-resistant up to 200 meters and comes with a stainless steel bracelet equipped with a three-fold clasp and push-button release.