Naoya Hida & Co. Cal. 3025PC

Cal. 3025PC is a manual-winding perpetual calendar movement developed by Naoya Hida & Co. It measures 30mm in diameter and 7.3mm thick, beats at 28,800 vph with a 45-hour power reserve and 19 jewels. The movement combines a Habring² A11B base with a Dubois-Dépraz QP module, featuring proprietary Naoya Hida bridges and click/spring design. It remains in production and powers the NH Type 6A, limited to approximately 10 pieces.