This movement has a balance frequency of 28,800 A/h and is based on the Grand Seiko caliber 9S55. You'll find these timepieces in the Marinemaster collection. Never-worn editions sell for between 2,400 and 3,600 USD, while pre-owned pieces change hands for as little as 2,200 USD. Golden Tuna watches are direct descendants of the Grandfather Tuna.