The case, in stainless steel, stainless steel black IP or stainless steel and gold, measures 43mm. It has double sapphire crystals (top with AR coating) and is water resistant to 100 meters.
Movement is the Japanese automatic Seiko in-house caliber 8R28 with 34 jewels, 28,800 vph and a power reserve of 45 hours.
This movement has a column wheel and a vertical clutch system and a unique one-piece three-pointed hammer that allows all three chronograph hands to reset instantly and in unison.


The technology pioneered by Cal. 6139/6138 now lives on in the Cal. 8R28 and Cal. 9R86 Spring Drive. These equip the Brightz Pheonix, as well as the chronographs in the Ananta and Grand Seiko lines.